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Old 03-13-2009, 09:19 AM   #1
jjsole
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Default 1/2 HP Garage Door Opener

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.
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Old 03-13-2009, 09:21 AM   #2
nickbits
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Default 1/2 HP Garage Door Opener

if the door is balanced properly it should be fine
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Old 03-13-2009, 09:24 AM   #3
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Default 1/2 HP Garage Door Opener

Make sure the tension spring is properly adjusted. If you can easily raise and lower the door when the drive is disengaged, it's good. The opener in my place is a Craftsman from 1976 with a remote control thing added onto it. The lights don't work right anymore, I know why but haven't gotten around to fixing it. But it's quiet and works well. So if it works, just use it
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Old 03-13-2009, 10:09 AM   #4
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Default 1/2 HP Garage Door Opener

You need to make sure that the springs are tensioned correctly. You aren't going to burn out the motor on any opener. You are going to strip the big nylon gear first. You'd be better off adding a second spring to your door to make it easier to open than to get a 3/4 hp opener.

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Old 03-14-2009, 10:36 AM   #5
jjsole
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Default 1/2 HP Garage Door Opener

Thanks for the replies. I've had some concerns about the door, altho since its under warranty I had them 'fix' it which included adding tension to the cable. Its slipped back into a little more resistance when its near the top again (this is a panel door) but otherwise pretty good. Once I install the door opener, the door is no longer under warranty (the warranty came with the house), so I think I'm going to bring him back first and then put it up.
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Old 03-14-2009, 08:48 PM   #6
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Default 1/2 HP Garage Door Opener

Was your previous motor old? I got a 3/4 HP Sears motor to replace my 1/2 HP motor and it wasn't enough. Supposedly the older ones were built a little better so it was actually more powerful. A more powerful one might be worth it for peace of mind.
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Old 03-14-2009, 09:00 PM   #7
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Default 1/2 HP Garage Door Opener

A 1/2hp should be more than enough for a basic 2 car garage with insulation. That's a fairly basic door that most people have.
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Old 04-04-2009, 04:52 PM   #8
jjsole
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Default 1/2 HP Garage Door Opener

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.
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