How do I know if my garage door opener is powerful enough for my door?

A few signs point to an underpowered opener: the door hesitates or stalls partway up, the motor strains or makes a labored noise, or the opener reverses on its own before reaching the top. As a rough guide, standard single doors typically pair with a 1/2 horsepower opener, while heavier insulated or double doors usually need 3/4 horsepower or more. A technician can check your door's weight and balance to confirm whether an upgrade is needed.