My parents have two of these in the attic of their new house. I went up there over the summer and it was noticeably cooler than the garage where the access is.

My parents have two of these in the attic of their new house. I went up there over the summer and it was noticeably cooler than the garage where the access is. This is in the summer in Texas. They also put their HVAC into the attic and the entire house is insulated with spray foam, so the attic only a few degrees warmer than the house below it. I need to ask them what the energy bills were but I imagine they were low enough to prevent complaint.