We are using Maine Solar Solutions. They are scheduled to install in August. We have an old farmhouse with drafty windows also. We wanted a system a little bigger than our current needs so we could install heat pumps in the future. The quoted us around 33k before the rebate. We got other similar estimates, but we really liked working with Maine Solar Solutions. Super easy to work with, very responsive, and they just know their stuff. Plus I heard a lot of really good things about them.