I’m in Minnesota, and we have a considerably larger house(roughly 3000 sqft), our usage is considerably higher than yours. I replaced our bulbs with mostly CFL last year, and our electricity consumption went down about 200kwh/month. I was actually surprised as it was around a $25/month savings. So replacing all the bulbs cost me about $300, and that worked out to less than a year payback.
Our main draws are the computers on all the time, and then the furnace fans. Our fans run nearly continuous just to circulate air. (Minnesota homes are sealed like submarines, so we have issues with moisture build up inside. We also have an air exchanger which circulates outdoor air into the house.)
The newer furnace units use a electronically commutated motors, and draw significantly less electricity, like 1/3rd of the draw of the older PSC style motors. I have seen some mention of retrofits, and was going to look at cost, otherwise it’s a whole furnace.
We had an issue this past summer with our AC evaporator coil leaking… that drove our electrical usage through the roof as the AC was running near constant.
Also doing research on this, a lot of AC systems in houses are oversized. People think bigger is better, but it’s not true. There’s a lot of calculations that go into proper sizing, especially CFM you can push through the pipes in the house. If you don’t get enough air flow, the evaporator coil will ice up. I think that’s what happened in our house, as we have zones, but the system was sized for the full house size, but with the zones half the house is shut off so the air flow is restricted.
I’m going to keep the current system running another 5-7 years and then just replace everything. In 2020 R22 isn’t going to be available for recharges anyway, so we’ll have to move to a R410 system if it breaks. That’s a $5-7k cost, so have to plan for it.