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How much horsepower does a garage door opener really need?
Updated
Less than the listings suggest. A garage door's springs carry its weight, and the opener only moves a door that is already balanced. DASMA says that if a door feels heavy or takes two hands to lift, the answer is not a more powerful opener. Fix the balance, then pick by fit.
What the horsepower number is
Older openers had AC motors rated in plain horsepower. Many current openers use DC motors, and the makers print an equivalent. Genie writes it as HPc. The Genie QuietLift Connect (3053-TKV) and the Genie Chain Drive 750 (7035-TKV) both say 3/4 HPc. The Chamberlain C2212T says 1/2 HP. The Genie Chain Drive 550 (2035-TKV) does not put a horsepower figure in its title at all, and the two wall mounts give none either.
What the makers say the motors lift
| Model | Power on the listing | Door weight the maker names | Door height as sold |
|---|---|---|---|
| Genie QuietLift Connect (3053-TKV) | 3/4 HPc | 500 lbs | 7 ft |
| Genie Chain Drive 750 (7035-TKV) | 3/4 HPc | 500 lbs | 7 ft |
| Chamberlain RJO20 Wall Mount | Not listed | 650 lbs | 14 ft |
| Genie SilentMax 1000 (3042-TKH) | 3/4 HP (140 V DC) | Not stated where we looked | 7 ft |
| Chamberlain C2212T | 1/2 HP | Not stated where we looked | 7 ft |
| Genie Chain Drive 550 (2035-TKV) | Not in the title | Not stated where we looked | 7 ft |
| Genie B6172H Wall Mount | 24 V DC, no HP given | 850 lbs | 14 ft |
Two things stand out. Genie says its 3/4 HPc rail openers lift a sectional door up to 500 lbs. And the units with no horsepower figure at all, the wall mounts, carry the biggest weight numbers: 650 lbs for the Chamberlain RJO20 per Chamberlain support, and 850 lbs for the Genie per its listing. The horsepower label is not a good guide to any of that.
Check the balance before you shop
Chamberlain's support page gives a simple check that works for sectional and one-piece doors. Close the door. Pull the release to disconnect the opener. Move the door by hand: it should move easily with one hand. Lift it 3 to 4 feet and let go. A balanced door stays in place, held by its springs.
If it drops, shoots up, sticks or binds, stop there. Chamberlain warns that an unbalanced door may not reverse when required, and says to always call a trained door technician. Do not adjust springs yourself.
When a bigger number is fair
Makers do pitch the higher rating for heavier doors and more use. Chamberlain's newer listings say the 3/4 HP motor is designed for frequent use. That is a maker claim, and we have not used any of these. If you have a heavy wood or insulated double door, read the door weight the maker names, not only the horsepower. If no weight is named, ask the maker.
Safety first. Springs, cables and bottom brackets are under extreme tension. Chamberlain's support pages say to never loosen, move or adjust them, and to always call a trained door technician if the door binds, sticks or is out of balance. DASMA, the door makers' trade group, says spring systems should be repaired only by trained professionals.
Run your own garage through the fit checker, or compare all 7 picks on the roundup page.