is pulled underneath through the vents 68 at the base fig9 is a cross section of the pool 28 and apron 30 as radiant energy is pulled into the pool heat goes to cold part of the convection cycle occurs in the pool 28 the pool cover if used exchange wall 32 and chimney 36 not shown in fig9 receive direct sunlight the exchange wall 32 and chimney connect directly to the mass in the first floor and therefore help to maintain a constant temperature in colder northern climates the pool 28 may be isolated from the ground this may help prevent overcooling or freezing as cold penetrates the solarium windows 26 above the cold air vents 68 it falls through the vents 68 into storage underneath fig1 10 a 11 11 a and 11 b illustrate an embodiment of an air flow cycle for maintaining constant temperature according to the method of the present invention starting at the base 34 of the building 20 air rising from the exchange wall 32 pool 28 and chimney mass cycles inside the building 20 to distribute heat or cold throughout the building 20 for example heat rises from the mass adjacent to the first floor and is guided into the second floor by a third floor extension 70 over the solarium as shown the remainder of the air continues to rise to the third floor 72 as the warm air rises it is distributed throughout the home cyclically as it cools it may be guided down the return air shaft 60 the return air shaft 60 may run from.