Garage Door Opener - 1/2 hp or 3/4 hp?
I want to replace a 20-year-old chain-driven garage door opener with a belt-driven one. I have tried to see what is the hp of the old opener, but there is nothing visible on it, and no information available, and I have no paperwork for it. The door itself is fine, so I will not be replacing the door. This is a one-car garage. The door is 7' high by approx. 9'6" wide. Is there a rule of thumb for figuring out whether I should be buying a 1/2 hp or a 3/4 hp opener? Thanks.