Sommer has the quietest Garage Door Opener on the Market. Unlike conventional garage door openers that use a noisy chain, belt or screw Sommer has only one moving part with no moving chain or belt. The motor glides silently along the stationary chain that is embedded in an indestructible steel rail, creating the quietest garage door opener available.  Now get the 1HP model at a price for a 3/4 HP model!