I just want to let everyone know I bought the Solar Attic and installed it myself. I have to say I am happy with the investment. Although it's been a warm Summer, I noticed it's ability to condition the water this Spring. I was able to heat my spillover hot tub yesterday to 99 degrees just with the solar. It was an 89 degree warm day so my 120 degree attic got the job done. I have a nice large attic with a Southwestern exposure and black roof so this all adds up to some real heat on sunny days.