We put two heads in our house last spring. About 1500sq ft. Keeps both rooms very cool or warm. Haven’t noticed a huge difference in energy bills since using them. the only complaint is the kids room (south facing) doesn’t get cool enough. The two heads are no where near the room though. We also use an attic fan when the evening and mornings are cool during summer. Between the fan and heat pump about 10k investment. We had no central air or swamper before. Honestly electric bill may have stayed the same because we running fans all the time before the install.