USRE32607E - Compact attic mounted solar heating pack assembly - Google Patents

Abstract

A compact attic mounted solar heating pack assembly includes an enclosed sheet metal plenum fixedly hung by straps from the attic rafters at the apex of north and south facing roofing sections. An electric powered blower fixed to the plenum has an air inlet open to the attic interior below the south facing roof section. An air outlet of the blower opens directly to the plenum interior. A plurality of flexible ducts are coupled to respective air outlets within the plenum at one end with their opposite ends terminating in diffusers mountable within holes formed within the underlying ceiling for delivering air from the plenum chamber directly to the building interior below the attic floor. A first normally open cooling thermostat is mounted within the attic at the apex, beneath the south facing roof section. A plastic heat barrier is hung from the ridge pole and extends well elbow the plenum chamber to trap heated air within the section of the attic beneath the south facing wall. A second heating thermostat is mounted within the building interior below the ceiling and preferably on an interior partition wall and is series connected with the blower motor and the first attic mounted thermostat and connectable to a source of electrical current. The normally open thermostat closes when room heat is needed and the temperature in the attic is above 70 degrees to provide an effective independent supplementary heating unit for the building.

Description

FIELD OF THE INVENTION

This invention relates to passive solar heating systems, and more particularly, to a low cost, compact solar heating pack assembly which may be mounted within existing dwellings and which functions to provide supplementary heating on bright sunny days, during the winter months.

BACKGROUND OF THE INVENTION

Passive solar heating systems have come into vogue for utilizing heat concentrated within a given area as a result of solar radiation for providing either primary or supplemental heating to a building interior during bright sunny days. The heat energy is absorbed by the building interior and transferred to moving air either by way of a thermal siphonic loop or by way of a duct system employing an electrical motor powered blower for circulating the air between the space in which the solar energy is absorbed and the various rooms of the building to be heated.

U.S. Pat. No. 4,084,573 discloses one type of prior solar heater in which a pyramidal solar heater is formed of translucent heat absorbing plastic material or the like. A spaced, smaller pyramidal structure interiorly of the first forms with the outer pyramidal structure dual air flow paths, whereby heated air may be moved out of the pyramidal solar heater downwardly into a room or enclosure underlying the same. Such structures are expensive, require modification of existing buildings or the incorporation of expensive additions within new building structures in order to achieve such circulation loop and to create a space wherein the sunlight may be absorbed and concentrated prior to transmission into the occupied rooms of the building.

U.S. Pat. No. 4,103,825 is representative of a solar heated building in which a solar window is provided within the south facing roof section and wherein attic interior air heated by the solar radiation is ducted to an occupied room by ducts passing through the dwelling ceiling. A horizontal wall divides the attic interior into an upper plenum chamber and a lower plenum chamber. Air is heated in the upper plenum chamber by solar radiation, conveyed to the rooms of the dwelling, while cooler air is returned to the upper plenum chamber from the rooms for reheating purposes. During hot weather, heated air is allowed to escape from the top of the upper plenum which, in turn, draws warm air out of the lower plenum into the upper plenum, thereby allowing cooler outside air to be drawn into the lower plenum. As such, the south facing roof requires modification by the presence of the translucent or transparent solar window, the interior of the attic is separated into two plenum chambers, the blower or forced air means is within the duct remote from the attic, and multiple separate ducts feeding the separated upper and lower plenum chambers which complicates the system.

It is, therefore, a primary object of the present invention to provide a compact, unitary passive solar heating pack assembly for mounting within an existing building attic for ready suspension at the apex thereof, wherein the building needs no modification, and wherein all of the components including the control elements, the hot air ducts and diffusers for mounting within the occupied room ceilings and opening to the room interiors are integrated to the pack assembly.

SUMMARY OF THE INVENTION

The present invention is directed to a compact atic solar heating pack assembly for suspension mounting within an existing conventional building at the apex of the building attic, which building has diagonally opposed south and north facing roof sections overlying a horizontal attic floor and forming the ceiling of the occupied rooms of the building. The attic is provided with vented eaves which open to the attic interior for supplying fresh air thereto. The pack assembly comprises a closed sheet metal plenum. Straps fixed to the plenum mount the plenum to the attic ridge pole just below the apex. A blower fixedly mounted to the plenum has an air inlet open to the attic enclosure and an outlet open directly to the interior chamber of the plenum. The blower includes an electric motor for operating the same. A plurality of air outlets within the plenum open to flexible ducts coupled at one end to the plenum chamber outlets, respectively, with the ducts terminating at their other ends in air diffusers, which diffusers are mountable within the attic floor opening through the building ceiling for delivering air from the plenum chamber to the occupied rooms below the attic. A first normally open cooling thermostat is adapted for mounting within the attic enclosure adjacent to the apex and below the south facing roof section. It is responsive to a relatively large increase in temperature of the air within the attic near the apex as a result of solar radiation impingement on the south facing roof section. A second normally open heating thermostat is adapted for mounting within an occupied room of the building, below the ceiling, and is responsive to room temperature. Cable means electrically connect the blower motor and the thermostats in series and are adapted for connection to an electrical power source so as to energize the blower motor through the thermostats. A blower outlet damper is provided at the plenum chamber inlet responsive to blower operation for permitting heated air adjacent to the apex of the attic to pass through the plenum, and into the building room interior below the ceiling through the attic floor, but prevent escape of air from the occupied rooms to the attic.

Preferably, a flexible heat barrier sheet is suspended from the ridge pole to extend across the attic, with the blower opening to the side of the flexible sheet facing the south facing roof section. The flexible sheet extends downwardly below the plenum to form a solar air heated space between the heat barrier flexible sheet and the south facing roof to concentrate the solar energy. The plenum may be suspended by straps extending downwardly from the ridge pole or the roof rafters. Preferably, the second heating thermostat is mounted to an interior partition wall of the building within an occupied room at some distance below the ceiling.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a vertical sectional view of a dwelling type building incorporating the compact attic solar heating pack assembly and forming a preferred embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the plenum forming a primary component of the pack assembly of FIG. 1.

FIG. 3 is an end view of the plenum of FIG. 2.

FIG. 4 is an exploded view, partially in section, of one diffuser for mounting within the attic floor and opening from the building ceiling into an occupied room of the building structure housing the attic solar heating pack assembly of which the diffuser forms one component.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to the drawings, the compact attic mounted solar heating pack assembly indicated generally at 14 has application to and is shown in combination with a building structure indicated generally at 10 which may be a dwelling, and specifically thepack assembly 14 is mounted within the attic indicated generally at 12. The essential components ofpack assembly 14; are asheet metal plenum 16, a scroll type electric motor driven blower indicated generally at 18, a plurality of flexible ducts indicated generally at 22 and mounted toplenum 16 viaoutlet thimbles 20, diffusers indicated generally at 24 coupled to the opposite ends of theflexible ducts 22 and mounted within theceiling 40 of thebuilding structure 10, acooling thermostat 26, heating thermostat 28,junction box 30 connected to a source of power, and a flexibleheat barrier sheet 32.

The invention resides inpack assembly 14 as well as the combination of the pack assembly andbuilding structure 10. In that respect,building structure 10 includes vertical outer walls as at 34 across which span a number of attic orceiling joists 36 which span across the upper ends ofwalls 34. Ceiling 40 underlyingjoists 36 separates theattic 12 from the occupied portion of the building, that is, the interior room orspace 42. A number ofroof rafters 44 incline upwardly fromwalls 34 and bear roofing at 46. The roof rafters 44 joint at their upper ends by being fixedly mounted to a horizontally extendingridge pole 48. Theridge pole 48 extends east and west so that south facing roof section, indicated generally at 50, extends to the left, while north facing roof section, indicated generally at 52, extends to the right ofridge pole 48.Ceiling 40 androof sections 50 and 52 form an attic space indicated generally at 54 separated from the interior, occupiedroom space 42. As may be appreciated, a number of vertical partition walls as at 56 separate the building interior into separate rooms.

As in conventional construction, theroof sections 50 and 52 extend beyond the building sidewalls as at 34, such that a number of eave openings orventilators 58 permit air to enter theinterior 54 of the attic at the lower ends of the roof, to each side thereof. If as in conventional buildings additional openings or ridge vents (not shown) are provided at opposite ends of the building just beneath theridge pole 48 to permit the air to exit in the summer, such ridge vent openings must be closed off during the winter months to permit the pack assembly to perform its function in providing auxiliary or supplemental heating to the building interior. Under such circumstances, it is important that theopenings 58 at the eaves be maintained so as to provide the source of air for circulation to the building interior after heating within theattic space 54. Such ridge vents or ventilators may be sealed off by placing thermal insulation over such openings. Alleave ventilators 58 need to be left open at all times.

The solarheating pack assembly 14 comprises principally the solar attic heater blower 18 andplenum 16, and this unit should be located as close to theridge pole 48 as possible and centered under theridge pole 48. Thepack assembly 14 is shown as being supported by perforated iron hangers orstraps 60 which may be nailed as at 62 at their upper ends to theroof rafters 42 or alternatively directly to theridge pole 48. The lower ends may be attached by rivets, bolts or the like 63 to plenum 16.

Plenum 16 comprises, in the form illustrated, a sheet metal box includingupper wall 66,lower wall 68, laterally opposed left andright sidewalls 70 and 72 andend walls 74 and 76, respectively. The edges may be welded or soldered together to form an essentially closed hollow cubic structure with the interior forming aplenum chamber 78. Arectangular opening 80 is formed withinleft end wall 74, while fourcircular holes 82 are formed within theright end wall 76, two at the top and two at the bottom. Welded or otherwise fixed toend wall 76 are four flangedcylindrical thimbles 84 which function to mount the air inlet ends of theflexible ducts 22. To the opposite side, there is directly mounted thescroll housing 86 of blower 18, one side of which is provided with a central, axial air inlet hole as at 88, forming the air intake to the blower 18. Anelectrical motor 90, for rotating the blower impeller (not shown), is mounted directly to thescroll housing 86. Thescroll housing 86 terminates in a tangential projecting portion 86a whose flanged end 86a' is directly mounted to theleft end wall 74 of theplenum chamber 16 at opening 80 by way of a series ofmounting screws 92 andnuts 94.

Within the tangential outlet duct 86a of the blower, there is suspended apivotable draft damper 96 which is hingedly mounted by atransverse pin 98 such that thedraft damper 96, absent blower operation, extends vertically downwardly from thehinge pin 98 blocking off the flow of air from theplenum chamber 78 in the direction of the scrollair inlet hole 88. During blower operation, the air entering theplenum chamber 78 discharges through the fourthimbles 84 and flows through theflexible ducts 22. In that respect, each of the fourflexible ducts 22 are connected to thethimbles 84 via a cabletype tie bands 104. Tie bands as at 104 are also employed at the opposite end of theducts 22 for coupling those ends of the ducts to other thimbles as at 102 whichthimbles 102 extend upwardly from the ceiling, passing throughcircular holes 106 provided within theceiling 40. Thecable tie bands 104, or equivalent hose clamps, function to provide an air tight seal between the ends of theflexible ducts 22 andthimbles 100, 102, respectively.

Thimbles 102 include flanged ends 102a which extend radially outwardly of theceiling hole 106 at the bottom of the thimbles. By way of nails orother fasteners 108 thethimbles 102 are physically mounted to theceiling 40. The interior of thethimbles 102 receive the upwardly projecting cylindrical portions 110a ofdiffusers 24. Additionally, removable disc-like filter cartridges 112 mount within the cylindrical portions 110a of thediffusers 24 so as to filter any of the air entering the interior 42 of the building structure rooms to be heated. Thediffuser 24 is conventional, and comprises a plurality of radially spaced, annular outwardly flared, nestedair deflectors 114 which tend to spread the air flow into the room interior; as indicated by the arrows, FIG. 1, as the air escapes from between the diffuser deflectors at the ends of each of the fourflexible ducts 22. A plurality of nails orscrews 116 permit thediffuser 24 to be detachably mounted toceiling 40 with the cylindrical portion 110a projecting internally of thethimble 102.

An important element of the attic solarheating pack assembly 14 of the present invention is the thin flexible, plasticheat barrier sheet 32. Thissheet 32, which may be of polyethylene or the like, is preferably of a vertical height such that it extends from theridge pole 48, to which it may be mounted by being tacked thereto along its upper edge by tacks 120 or staples or the like. Its lower edge 32a may lie several inches above theattic rafters 36 or attic floor (not shown), if such floor is mounted directly to the upper edge ofrafters 36. As such, the thin flexible plasticsheet heat barrier 32 separates theattic space 54 into a heat concentration area 54a to the left of thesheet 32 and beneath the south facingroof section 50 from the attic space 54b to the right of thatflexible sheet 32, which is normally considerably cooler, since the angle of inclination of the north facingroof section 52 is such as to prevent the absorption of significant amount of the thernal energy from the sun during the winter months.

As shown, the sheet passes through the center of theplenum 16, and thesheet 32 may be purposely cut out so as to receive theplenum 16 without significant air passage about the periphery of the hole withinsheet 32 through which the cubic form plenum passes. Further, as may be appreciated, two of the diffusers andflexible ducts 22 pass to the left of the flexible sheet and open up to the building room interior 42 to the left of thevertical partition wall 58, while the other two open up to the right of that partition wall. The flexible ducts leading todiffusers 24 to the right are shown as penetrating the plasticheat barrier sheet 32. However, lower end 32a of theheat barrier sheet 32 may terminate just above those duct members. Further, theflexible ducts 22 may lie on top of the attic joists 36 to pass beneath the lower end 32a of the thinflexible sheet 32.

Further important components of the atic solarheating pack assembly 14 comprise the twothermostats 26 and 28 for controlling the operation of the scroll type blower 18 and thejunction box 30 as well as the electrical wiring indicated generally at 122, all components of the electrical control system for automatic operation of the supplementary heating system. In that respect, coolingthermostat 26 is shown as being mounted to one of theroof rafters 44 to the left of the heat barrierflexible plastic sheet 32 and to the same side thereof as the scroll type blowerair inlet hole 88. The second, heating thermostat 28 is shown as being mounted to partition wall 56. Theelectrical wires 122 connect the heating thermostat 28, theelectric drive motor 90 for the scroll type blower 18 and the coolingthermostat 26 in series throughjunction box 30 from whichcable 124 extends for connection to a source of electrical power as indicated generally byarrow 126.

This completes the components of the attic solarheating pack assembly 14. For the electrical control system, a separate fuse and grounded circuit is recommended. Boththermostats 26 and 28 andblower motor 90 may operate on 115 volts AC, with the components wired in series as shown. Withcable 124 connected to a power source such as 115 volt AC electrical source as indicated byarrow 126, control knob 28a of the heating thermostat 28 is set, as is control knob 26a of coolingthermostat 26, such that the electrical power comes to the heating thermostat first whose contacts close when the room temperature drops below a preset value as, for instance, 65 degrees. The normally open contacts of the heating thermostat 28 close completing a circuit through themotor 90 from the source of electrical power viajunction box 30 to coolingthermostat 26. Its contacts remain open until the temperature reaches a predetermined value in space 54a to the left of the plastic heat barrierflexible sheet 32 at the apex of the attic 12. When the temperature reaches, for instance, 70 degrees F. heat concentration in the attic space 59a, the normally open contacts of the coolingthermostat 26 close, causing the blower motor to start operation. As it starts, air at 70 degrees enters theopening 88 within the side of theblower scroll 86 and flows intoplenum chamber 78 by deflecting thepivotable draft damper 96 to the right, FIG. 2. Air then flows through all fourflexible ducts 22 to thevarious diffusers 24 for the rooms within the building interior. Thus, the flow of air forces thedraft damper 96 to open and the warm air goes through theplenum chamber 78 and through theducts 22 downwardly into the interior of the building, i.e. to theroom space 42. When the temperature drops in the attic 12, the unit shuts down automatically.

As may be appreciated, the attic solar heating pack assembly will provide heat much more efficiently during the cool months of September, October, November, March, April and May, supplementing the primary heat supply to the building structure as otherwise provided. Thus, since there exists a 24 degree F. to 30 degree F. difference between the attic temperature and outside temperature of a building structure during the months of late November through February or about 1:00 P.M. on clear sunny days, because of the increase of the length of days and the increase of the angle of the sun rays, the unit will heat much more efficiently during the months of September, October, November, March, April, and May, and the ability of the unit to provide heating for the building structure will increase substantially for buildings within the southern states.

As may also be appreciated, the draft damper effectively closes off the plenum inlet when the blower motor is de-energized. thereby preventing heat loss from the room interior to the attic 12 via theflexible ducts 22,plenum chamber 78, andblower inlet 88. Further, dampers incorporated within the diffusers may be set to regulate the volume of air reaching a given room, that is, discharging through a givendiffuser 24 into the building interior beneath theceiling 40.

While the invention has been particularly shown and described with reference to a preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (8)

What is claimed is:

1. A compact attic solar heating pack assembly for mounting within a building attic having diagonally opposed south and north facing roof sections overlying a horizontal building attic floor forming the ceiling and defining an enclosed attic space above the occupied room space below the ceiling, said building further including vented eaves opening to the attic enclosure at the bottom thereof, said pack assembly comprising:

a closed sheet metal plenum,

means for fixedly mounting said plenum within said attic just below at said apex,

a blower fixedly mounted to the plenum, said blower having an air inlet open to the attic enclosure,

said blower including a blower outlet opening to the interior of the plenum,

an electric motor for driving said blower,

a plurality of air outlets within said plenum,

flexible ducts coupled at one end to said plenum chamber outlets, respectively, and terminating at their other ends in diffusers, said diffusers being mountable within said attic floor and opening through the ceiling for delivering air from said plenum chamber to the interior occupied rooms of the building,

a first, normally open, cooling thermostat adapted for mounting within said attic enclosure adjacent said apex and responsive to a substantial increase in temperature of the air within the attic enclosure over the outside air based on direct solar radiation through said south facing attic roof section,

a second, normally open, heating thermostat adapted for mounting within the interior of said building below said attic and responsive to the temperature of the interior room,

cable means for electrically connecting said blower motor and said first and second thermostats in series and adapted to energize said blower motor via a source of electrical power upon closure of said normally open first and second thermostats, and

a blower outlet damper at said plenum chamber inlet for automatically closing off the inlet to the blower from the building interior via said flexible duct to prevent loss of heat from the room interior back through the attic.

2. The pack assembly as claimed in claim 1, further comprising a flexible heat barrier sheet extending throughout the attic from one end to the other and hanging downwardly from the apex of the attic space towards the floor of the attic and to a position at least below the plenum chamber to separate the attic interior into a heat concentration space between the flexible heat barrier sheet and the south facing roof section.Iadd., and said blower air inlet opening to said heat concentration space.Iaddend..

3. The pack assembly as claimed in claim 1, further comprising straps extending upwardly from the plenum chamber for mounting to the attic structure above the plenum chamber such that the plenum chamber is suspended from the ceiling roof at the apex of the attic.

4. In combination, a building structure and compact attic solar heating pack assembly, said building structure comprising:

vertical support walls,

horizontal attic joists mounted to the upper ends of said building walls and extending therebetween,

roof rafters extending upwardly from opposite sidewalls of the building structure towards each other and being inclined from the horizontal,

a ridge pole connecting the upper ends of said roof rafters,

roofing covering said roof rafters,

and a ceiling underlying the ceiling joists to define with said vertical walls and said roofing, an essentially closed attic space,

said roof rafters projecting beyond the ends of said sidewalls and open eaves formed within the roof structure to permit air to enter the attic interior space,

interior vertical partition walls within said building,

said solar heating pack assembly comprising:

a closed sheet metal plenum defining a plenum chamber,

means for mounting said plenum within said attic space just below said ridge pole,

a blower fixedly mounted to said plenum,

said plenum having an air inlet and a plurality of air outlets,

said blower including an air inlet opening to the attic interior and an air outlet opening directly to said plenum chamber,

an electric motor for driving said blower,

a blower outlet damper within said plenum chamber inlet for automatically closing off the passage from said plenum chamber to said blower upon termination of energization of the blower motor,

flexible ducts coupled at one end to said plenum chamber outlets, respectively, and terminating, at their other ends, in air diffusers,

holes within the building ceiling sealably receiving said diffusers, whereby air is delivered from said plenum chamber through said flexible ducts to the building interior, via said diffusers,

a first, normally open, cooling thermostat mounted within said attic space adjacent said ridge pole,

a second, normally open, heating thermostat mounted within the room interior on said partition wall, below said ceiling,

a source of electrical power within said building interior,

wires electrically connecting said blower motor and said thermostats in series and across said electrical source for energizing said blower motor through said thermostats such that said second, normally open, heating thermostat closes upon droppage in room temperature, and said first, normally open, cooling thermostat closes as a result of thermal radiation on said south facing roof section of sufficient magnitude raising the temperature of the air within said attic space to a level above that of the temperature of the room to be conditioned;

whereby, hot air from the attic space is pumped into the room interior for supplemental heating under such conditions.

5. The building structure and pack assembly as claimed in claim 4, further comprising a flexible heat barrier sheet extending across the length of the attic from one end to the other, having an upper end fixed to the bottom of said ridge pole, and a lower end extending beneath said plenum chamber to thereby function to concentrate solar induced heat between said flexible heat barrier sheet and said south facing roof section, thermally isolated from the space to the opposite side of said flexible heat barrier sheet underlying said north facing roof section.Iadd., and said blower air inlet opening to said space between said heat barrier sheet and said south facing roof section.Iaddend..

6. The building structure and pack assembly as claimed in claim 4, wherein said means for mounting said plenum within said attic at said apex comprises a plurality of straps fixed at their lower ends to said plenum and at their upper ends to the rafters to opposite sides of said ridge pole. .Iadd.

7. A compact attic solar heating pack assembly for mounting within a building attic having south and north facing roof sections overlying a horizontal building attic floor forming the ceiling and defining an enclosed attic space above the occupied room space below the ceiling, said pack assembly comprising:

a closed sheet metal plenum,

means for fixedly mounting said plenum within said attic just below at said roof,

a blower fixedly mounted to the plenum, said blower having an air inlet open to the attic enclosure,

said blower including a blower outlet opening to the interior of the plenum,

an electric motor for driving said blower,

at least one air outlet within said plenum,

a duct coupled at one end to said plenum chamber outlet and terminating at its other end in a diffuser, said diffuser being mountable within said attic floor and opening through the ceiling for delivering air from said plenum chamber to said occupied room space of the building,

a first, normally open, cooling thermostat adapted for mounting within said attic enclosure adjacent said roof and responsive to a substantial increase in temperature of the air within the attic enclosure over the outside air based on direct solar radiation through said roof,

a second, normally open, heating thermostat adapted for mounting within the interior of said building below said attic and responsive to the temperature of the interior room,

cable means for electrically connecting said blower motor and said first and second thermostats in series and adapted to energize said blower motor via a source of electrical power upon closure of said normally open first and second thermostats, and

a blower outlet damper at said plenum chamber inlet for automatically closing off the inlet to the blower from the building interior via said duct to prevent loss of heat from the room interior back through the attic. .Iaddend. .Iadd.8. The pack assembly as claimed in claim 7, further comprising a flexible heat barrier sheet extending within the attic spanning at least across the metal plenum from one end to the other and hanging vertically downwardly from the roof of the attic towards the floor of the attic and to a position at least below the plenum chamber to separate the attic interior into a heat concentration space between the flexible heat barrier sheet and the south facing roof section, and said blower air inlet opening to said heat concentration space. .Iaddend. .Iadd.9. In combination, a building structure and compact attic solar heating pack assembly, said building structure comprising:

vertical support walls,

horizontal attic joists mounted to the upper ends of said building walls and extending therebetween,

roof rafters extending from opposite sidewalls of the building structure,

roofing covering said roof rafters,

and a ceiling underlying the ceiling joists to define with said vertical walls and said roofing, an essentially closed attic space,

said solar heating pack assembly comprising:

a closed sheet metal plenum defining a plenum chamber,

means for mounting said plenum within said attic space just below said roof,

a blower fixedly mounted to said plenum,

said plenum having an air inlet and at least one air outlet,

said blower including an air inlet opening to the attic interior and an air outlet opening directly to said plenum chamber,

an electric motor for driving said blower,

a blower outlet damper within said plenum chamber inlet for automatically closing off the passage from said plenum chamber to said blower upon termination of energization of the blower motor,

at least one duct coupled at one end to said plenum chamber outlet and terminating at its other end in an air diffuser,

a hole within the building ceiling sealably receiving said diffuser, whereby air is delivered from said plenum chamber through said flexible ducts to the building interior via said diffuser,

a first, normally open, cooling thermostat mounted within said attic space adjacent said roof,

a second, normally open, heating thermostat mounted within the room interior below said ceiling,

a source of electrical power within said building interior,

wires electrically connecting said blower motor and said thermostats in series and across said electrical source for energizing said blower motor through said thermostats such that said second, normally open, heating thermostat closes upon droppage in room temperature, and said first, normally open, cooling thermostat closes as a result of thermal radiation on said roof of sufficient magnitude raising the temperature of the air within said attic space to a level above that of the temperature of the room to be conditioned;

whereby, hot air from the attic space is pumped into the room interior for

supplemental heating under such conditions. .Iaddend. .Iadd.10. The building structure and pack assembly as claimed in claim 9, further comprising a flexible heat barrier sheet extending across the attic from one end to the other, having an upper end fixed to the bottom of said roof, and a lower end extending beneath said plenum chamber to thereby function to concentrate solar induced heat between said flexible heat barrier sheet and a solar radiation roof section, thermally isolated from the space to the opposite side of said flexible heat barrier sheet, and said blower air inlet opening to said space between said heat barrier sheet and said south facing roof section.

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