How much garage door opener horsepower is enough? Personally, I would steer away from 1/3 HP models unless you have a lightweight, 1 car garage door. Modern, high quality 1/2 HP models are. suitable for most 1 and 2 car garage doors.
http://www.garagehowto.com/garage-door-opener-horsepower.html
Once you're in, the PosiLock system will make sure the garage doors are closed tight behind you. You receive two remotes with this 1/2 hp Chain Drive Garage Door Opener. Keep one for yourself and give another to a family member or friend if you have a double garage. If it happens that you lose your remote, you can open from inside the house.
http://www.sears.com/craftsman-1-2-hp-chain-drive-garage-door-opener/p-00953930000P
When you open your garage door, with or without a garage door opener, the bulk of the work is actually done by the counterbalance, a system of springs, pulleys, cables, etc., that make it possible for your garage door to open and close easily.
http://www.garagehowto.com/garage-door-opener-horsepower.html
1 Balance your garage door and take care of periodic maintenance. 2  For most garage doors, a good quality, highly rated 1/2 HP model is adequate.  For very heavy or tall garage doors, look at a 3/4 HP or even a 1 HP model. The price difference is usually only $50 to $100, depending on the brand.
http://www.garagehowto.com/garage-door-opener-horsepower.html
971LM Series Remotes. All of these remotes work for sears craftman garage doors made between 1998 and 2005. Please check the Compatibility Chart if you are unsure whether your 139 model number is for the 971LM series remotes listed here. Sort by: Featured Items Newest Items Bestselling Alphabetical: A to Z Alphabetical: Z to A Avg.
http://www.aclickawayremotes.com/971lm-series-remotes/
If you have a 3 car garage with 3 garage door openers, here is what you could expect: 3 openers x 4 Amps = 12 Amps for the opener PLUS 3 lights x 1.67 Amps = 5 Amps for the lights. Keep in mind these numbers are at the high end of the average.
http://www.garagehowto.com/garage-door-opener-electrical-breaker-size.html
Garage Door Horsepower Bottom Line: 1  Balance your garage door and take care of periodic maintenance. 2  For most garage doors, a good quality, highly rated 1/2 HP model is adequate.  For very heavy or tall garage doors, look at a 3/4 HP or even a 1 HP model.
http://www.garagehowto.com/garage-door-opener-horsepower.html
The breaker size depends on the type of garage door opener you have and how many you have. If you have a 1 car garage, a 15 Amp circuit is more than adequate. If you have a 3 car garage with three openers you may want to consider a 20 Amp circuit breaker. Here are the details: Most modern garage door openers draw from 3 to 5 amps, depending on what type of lighting your opener has. If your opener has a 200 Watt lighting system, for example, the lights alone will draw just under 2 Amps. Amps x Volts = Watts. Thus, Watts / Volts = Amps.
http://www.garagehowto.com/garage-door-opener-electrical-breaker-size.html
1/2 hp Chain Drive Garage Door Opener Opens by Remote, Inside and from Car. Enjoy a great end to every day by installing the Craftsman Garage Door Opener with Anti-Burglary Coding today. The 1/2 HP motor lifts your garage doors gently and doesn't close until it's sure you've arrived safely inside.
http://www.sears.com/craftsman-1-2-hp-chain-drive-garage-door-opener/p-00953930000P
How to Choose a Garage Door Opener. With so many different types of garage door openers on the market, you may not be sure where to start. The main consideration for a garage door opener is the drive type, which refers to the actual chain, belt, or other mechanism that moves and lifts the door. In some circumstances, the horsepower output of the motor should be considered as well, but typically in commercial or industrial settings.
http://www.wikihow.com/Choose-a-Garage-Door-Opener
what hp garage door opener do i need
You need 1/2 Hewlett-Packard garage door opener. You need a 1/2 HP garage door opener.