As an experiment last summer I hooked up a 1/2 horse submersible pump. 2 month electric bill was $200 higher than normal. Doesn't take long to pay for a compressor at those rates. Moving water had an impact but not something I wanted to do long term. I found a 5023 Rotary Vane Gast brand new for $385. From what I hear I should expect an electric bill of under $15. We'll see, have only had it in a couple of weeks.
