I recently installed a Envision Water Furnace 4 ton.There is a loud compressor hum that seem to transmit into the walls and then into rooms especially above the unit. It is particularly noisy on the stage 2 and 3 heat cycle. The was no room for a flexible collar on out plenum. The noise upstairs is almost the same as downstairs and I have put ROLUX noise insulation above the unit but this did not seem to make a difference.
My question is if this is normal or is this being caused by the fact that the vibration noise is traveling into the heat duct and being sent around my house and in the walls.
Any ideas how to quiet it down?
Photos : http://picasaweb.google.com/jake3557/Waterfurnace#