[jseban]

Yeah it's a temporary effect and once the walls have heated up, it actually makes it worse since it retains the heat at nighttime as well.

You need to drill down to access the constant temperature in the ground, to be able to really counterbalance the differences in the air temperature. Once you've drilled down I guess you can make a passive or minimal energy circulation system that would be much more energy efficient than air conditioning.

[bombcar]

It’s called a geothermal heat pump and they’re quite efficient in the places they can work (which is basically anywhere that has enough temperature differential during the year).

[noirbot]

I had an issue with this last fall - had my AC go out in the fall when it had been over 80F for the last few months. Outside, it would be 70 during the day and 50 overnight, but there was so much heat in my walls/floors that I literally couldn't keep my apartment below 80. If I opened every window and door, I'd get down to 75 or so, but it would be back to 80 within an hour, even when the temperature outside was significantly cooler.

It's great in the winter though. I haven't had to turn my heat on in years.