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

ak0402November 9, 2010

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.

Thank you for reporting this comment. Undo
measure_twice

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

    Bookmark   November 9, 2010 at 9:02PM
Sign Up to comment
More Discussions
Need help diagnosing Chamberlain Garage Door Problem
Hi, Have a 1/3 Chamberlain Liftmaster that started...
koalb01
Allister GDO not closing with remote
Having a problem with my Allister Access 3500 GDO not...
irishh7
Custom Wood Garage Doors
Does anyone know or have experience with wood garage...
linda_1010
2x6 strength? How much weight will a truss in my garage hold?
I want to build an engine hoist in my garage. I found...
work.truck
What's the Lowdown on Garage Door Brands??
I have read some prior posts on steel garage door brands...
Xena99
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™