I'm working on a sci-fi story set in the distant future where the average daily temperature ranges from 100-120 degrees F. The idea is to have most outdoor activity occur at night, when temps are lowest, with people staying indoors during the day.
Is there a way of existing indoors without A/C when its 120 degrees outside, such as unique building/insulation techniques, building into the earth (presumably cooler). Obviously, it's possible to cool off a home at night (down to 100 degrees) simply by opening the windows, but can I hold that temperature indoors until the next night? I'd like it to be marginably realistic but my knowledge in this area is marginable at best.
If appropriate, please let me know if there is a forum where I should cross-post to (where they won't get annoyed by a sci-fi question).
Thanks.
D