I hear alot of people talking about their power bill when it gets hot. Either the insulation or craftsmanship of houses has taken a nose dive. I grew up in a house built in the late 70's and during the summer it stayed at 72 degrees. I never saw a power bill over 150$. My house was built in the early 70's and I keep the thermostat on 68 from 6-6, my largest power bill to date 134$. I think the older homes are more energy efficient compared to the new ones