My husband is an electrical too, and I have heard the same things about power use. He although is in no big hurry to be conservative, and 1st to complain about the bill going up b/c of winter! In Oklahoma, I keep our thermostat at 74, I hate being cold and am still suffering in a sweater! I wouldn't think of turning the heat down at night! I did hear that keeping the thermostat should be kept at the same temp, maybe keeping it at a lower temp all the time, this keeps the heater or a/c from kicking on all the time and run time down. This info came from the electric company, and my husband backs it up, he also used to moonlight installing heating and cooling systems. If you keep your equipment clean and maintenanced regularly, then you have a more efficient system even if its old, especially if its old. They always get worse on usage as they age, so keeping it in good shape will help. We couldn't afford to upgrade to an energy efficient system right now, so we have to use what we have and this probably applies to many. So clean it out, change filters, use good filters- the cheap ones allow a lot of dust into the motor parts and this leads to resistance which =more amp draws. For those who haven't had the electrical speech- amp equal money, not volts. If I ever get that lecture again-I will scream! Lol! So look at your amp draws, and look at the condition of those big items, if the insides are dirty its drawing more amps and is less efficient. Microwave is a big one, and tend to wear out faster so end up drawing closer to the max amp load faster than most appliances. if you would like to hear his microwave speech, I can r3ecord it for you! I say this b+c I think this has been overlooked, and when you dont get these speeches, you forget! That's why I've heard them so much! Lol! also just to add more lecture. , you should never change the fuses with a different fuse. It has to be the same! Or you will end up ruining your appliance, wiring, or burning down your house, or if you go too small it won't work. Just thought I would add that