My new house is ICF with a geothermal system. I can't wait til it's done and I can move in. I've never had central air. That was one of the top 3 requirements for this house that I would not compromise on. I'll probably have the thermostat on 75 year round. Supposedly these ICF houses can be heated and cooled for $4-600 the entire year. I'll find out.
Obviously these are programmed. If conditions warrant I'm not opposed to adjust accordingly. Typically in the winter I'm running around in shorts and t-shirt and the gf is in long sweats, thermal socks, hoodie and two blankets. Now that I think about it that is pretty much our summer home attire also!
Summer: A work in progress. We only moved in last September, and we really like to use the "off" option as much as possible. I just went and checked through the programming for summer...it needs some tweaking, but it looks like 6-8am 68, 8am-4pm 85, 4pm-10pm 78, 10pm-6am 82. Not sure if that makes any sense or not, though...!
i must be the only one with out air conditioning still. thats ok. single story house with light colored shingles and a whole house fan. never gets more than 79-80 degrees during the peek of the day in the summer.
as for the winter. i try to heat my house with wood so the temp fluctuates between 65-80 depending on what type and how much wood i keep busy putting in there.
Winter:
Monday - Friday
4:00 am to 5:30 am 62
5:30 am to 5:30 pm 50
5:30 pm to 9:30 pm 62
9:30 pm to 4:00 am 55
Saturday & Sunday
6:00 am to 10:00 pm 62
10:00 pm to 6:00 am 55
I like it very cool almost cold when I sleep plus these settings save me big time on my NIPSCO
Summer:
Monday - Friday
4:00 am to 4:00 pm 80
4:00 pm to 4:00 am 62
Saturday & Sunday
Adjust as needed depending on if I am home and inside, Sleep temp is always 62