Chain drive is significantly louder. If it's an ongoing issue switch to a belt driven model. My only advice as far as horsepower goes is just making sure the 1/2 HP motor is rated for a garage door larger than the size of your door. I believe 1/2 HP are generally used for single doors and 3/4 for double. I'll check the rating of mine (16' by 7' door). I'm not positive on the HP ratings however.
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Originally Posted by puckhog
Everyone who disagrees with you is stupid
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