I have a very complicated 1.5 story on a basement that was running space heaters in 2 levels and a window air unit in the top floor because the 2 systems weren't keeping an even temperature. Cool Masters came in and installed zoning and additional duct work. I was able to unplug the space heaters and toss the window AC. All levels feel a nice consistant 70 degrees. I can't wait to watch my electric bills go down.