For heavy garage doors, such as carriage doors, a 3/4-horsepower model is a better choice. When in doubt, go with more power, as the price difference is not significant. The standard door garage is 7-feet tall, and the standard garage door opener will accommodate doors up to 6 inches taller than that. The size of the door affects the price along with the power of the garage door opener you need to purchase, so you should begin by measuring your garage door. Standard garage door sizes are 8×7, 9×7,16×7, 8×8, 9×8, 16×8. Prices for a 16×7 door will naturally be nearly twice the price, a 9×7 door to be about 10% more and then add 20%-25% for doors that are 8 foot high. In all the size of the door dictates the power needed to lift the door.
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