Go with 1 2 hp for a double door and 3 4 hp for a door that has a wood or faux wood overlay they can be heavy.
How to install a replacement garage door opener.
Choose the right garage door opener.
Install the end of the rail in the bracket that held the old opener above the garage door and secure it with the fastener bolts or clevis pin.
There are two basic types of garage door openers chain driven and belt driven.
When buying a garage door opener choose a 1 3 hp or 1 2 hp garage door opener for a single garage door 1 3 hp can be hard to find at some home centers.
Some brands may work with even older door opener units.
If your opener model is no longer manufactured it may not be easy to find a new remote designed specifically for your opener.
Choose a garage door opener.
Mount the new motor in the same location as the old one.
Consider this when making the choice of what opener to buy.
A belt driven garage door opener can be a bit quieter during operation.
This home depot guide will explain the cost to install garage doors and openers or replace existing ones so you can decide which options are best for your budget.