We have hot water heat in our 100+ year old farmhouse, so there is no ductwork that can be used ro4r central air. My husband was leery of window air conditioners damaging the windows, so for years we went without. I finally could take it no longer, and 2 years ago we bought 2 of these units for our downstairs. The only problem I see with them is that they are not quiet, but I can live with that. Our electric bill has not increased dramatically like we thought it might. Now we are thinking about getting 2 units for our upstairs, just to run at night.