There have been two in-depth studies done on this topic. Both included NY State in their data set. The findings were clear. Homes with solar sell for more money and faster than homes without it. It’s not hard to understand why. Who wouldn’t want to wipe out one of their biggest monthly bills outside of the mortgage? In New York specifically, homes were found to sell for an average of 5.4% more when they had an owned solar system on them. That’s an increase of $30,357 for the average home in Nassau County and $35,289 in NYC.