Did the research and concluded the Drolet HT-3000 would take care of my 2700 sq.ft. home. Renovation Reserve is a excellent company to work with. Gentleman I talked to was very knowledgeable and answered all my questuon. I ordered the Blower and thermodisc. The Disc was not in the shipement when arrived. Called Renovation Resourses and no questions ask.They simply sent me a replacement. In my opinion that is how you do business. Would have no problem purchasing from them anytime.