[oxryly1]

> insulation and air tightness afford the house the property of staying the same temperature on the inside regardless of the temperature on the outside, more or less.

But how is that initial temperature determined? If the house is built in a area during a time of year where the average air temperature is about 85F, then will the house always be too hot? How does it get cool (or hot) in first place?

[wheresmyusern]

the initial temperature, in that ideal system, is determined by deliberately making it hot or cold with a small sized air conditioner or heater. so in the ideal system you heat or cool once and then never again.