What are the chances a 1/2 hp craftsman garage door opener is strong enough for a 2-car garage door with insulation? I moved into a new house recently and am trying to avoid buying a new opener, but if its not even worth trying, I'll just sell the 1/2 on craiglist and upgrade. I don't want to carelessly kill the 1/2hp motor first tho. UPDATE 4/4: I had the garage door installer back to adjust the door. He lubed it and widened the runner on one side at the top, where resistance was greater the further it opened. Its very smooth and loose-feeling now. So I installed the 1/2 hp opener last night and it takes near max force to open it, but is very quiet (relatively speaking) and overall works great.