I have one currently. Installed it this summer. Ran amazing for air conditioner all summer and hardly noticed any draw on the solar panels. Tried to use it for heating, but in my area to many gray days......so most of the time its off and am using the wood stove, but when the sun is out it is still working even though its gotten in the negatives this winter. I have a 1300 sq ft house. I would say it keeps half of it warm. Here is a video of when we ran it in the summer time and I have an instal/update video on my channel if you want to see how it looks.