Grant it I got a small home but I have enjoyed having window units more than. Central. I can run each room at what I want.

I can run 3 window units (thinking of getting a 4th to help the big living room one keep up when cooking) and my electric bill is $100 or more cheaper than running the central. That is even with the window units running 2-3 times longer.

1985 3.5 ton trane at minimum sucks probably 4200watts. All 3 units running in tandem suck about 2000 a fourth 5k-6k unit for the kitchen would put me at 2400-2500 watts.