Honestly, I think I could sleep in a fridge. On the hottest nights, I might nudge the thermostat down to about 76, but I have to bump it back up after I get up. We have done so much to the house to reduce energy costs, including new high SEER A/C's, dual-pane low E windows, a ton of blown-in insulation, CFL's everywhere, off-peak use, etc. However, it seems SRP has eaten up every saving with price increases. My next house will be off the grid if I can swing it.
