Have a new RUUD 3 ton heat pump (UPRL-036JEC - Model Number & RHPL-HM3621 Air Handler). This summer it was extremely quiet to run, but since we have turned it to heat it is very loud with noisy vibration inside the house. You can hear it all over the house. The outside unit still runs relatively quiet not as quiet as cool cycle, but still quiet enough.
What is the big difference in the 2 cycles and what can we do to eliminate this noise on the inside of our house?
We have been very satisified with this new communicating system so far except this noise problem.