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Garage Door Opener - 1/2 hp or 3/4 hp?

Posted by akchicago (My Page) on
Tue, Nov 9, 10 at 16:54

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.


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RE: Garage Door Opener - 1/2 hp or 3/4 hp?

Regardless if you have a heavy, solid wood door or a light metal door, the garage door springs do most of the work of opening the door. My door is double wide, heavy wood, has weak springs, and the 1/2 hp chain opener wore out after only 8 years. (yeah, it did OK)

So, first determine if your garage door springs are sufficient. A very rough rule of thumb is you can open the door half way and the springs will hold it. (Yes, you disconnect the opener when you are testing this.)

If the door flies up or crashes down, you may be able to adjust the springs. They are powerful but I have done it slowly, carefully, and safely. DIY instructions at the professional site below.

After the springs are set reasonably (not perfectly), any 1/2 hp will do fine.

Here is a link that might be useful: DDM garage doors


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