The answer is because they loose heat. And what if we could build a house much like a thermos and prevent the heat from escaping through the building? That is exactly the winning formula on which the Passive House Science is based. The results are amazing: 90% savings in space conditioning energy (heating and cooling).
What is left is amount of energy so minuscule that you could theoretically heat your home with a hair dryer.
Here are the 6 most important principles:
Super Insulated
Super-insulated building envelope with insulation levels 3-5 times greater than conventional.
Eliminating thermal bridging through special detailing.
Super Windows
Triple glazed windows with insulated frames and thermal bridge free installation.
Air Tightness
Eliminating air infiltration losses through installing a continuous air barrier. Air- tightness verified through blower door test.
Air Tightness
Whole House Ventilation
Free Gains
Maximizing the free passive solar gains.
Energy Modeling
Rigorous energy modeling to verify specific performance targets. and design the mechanical systems.
Have you ever heard the saying “The cheapest gallon of fuel is the one you don’t need”?