Just skimmed through this thread for the first time. Great thread, but man – you got problems !
First, have FLU rewire your thermostat so it reads “78” when it is actually 72, unless it is Summer, then have it read 65when it is actually 72. It’s a complicated algorithm, but he seems pretty smart.
Second, the refrigerators raise a big red flag with me. We once had a 2nd fridge, then took it out and noticed a change in the bill. We have since replaced it. We love it but it is an electricity hog. Buy less wine, or have a party and drink it.
Focus on the big things first. Lights and computers seem minimal. Maybe put motion sensing swithces on them instead of different bulbs. I hate flourescents. Hate them, hate them.
Refrigerators, dehumidifiers, and heaters are important. See what you can do with those. I agree with the last poster – those single-room electircal units and the 78-degree winters are the problem. The central systems may actually be better than these single-room systems. Another tip there – get a programmable thermostat that keeps the room at (gulp) 78 until your wife is asleep, then drops down to 65, then back up to (are you kidding ?) 78 before she wakes up.
I notice our usage is lower this year but our bills are higher – can’t do anything about that.
In the name of truly identifying the causes, don’t do too much at once or you won’t know what helped.
Maybe put timers on the TVs to shut them down during non-use hours, then back on for convenience.