I am living in a new condo with a brand new ClimateMaster Genesis Geothermal heat pump.
I noticed last night that the A/C wasn't working. I checked it this morning, and there was a huge block of ice that had formed on the coils (took up about 1/3 of the coils). The filter looked dirty, but I had just put it on there a week ago. Does it seem reasonable that the filter could've gotten so dirty in a week that the coils froze up like that? The HVAC unit is in a large closet above my master bathroom. There is a lot of spare insulation lying around up there. Could that be the source of a lot of the dust?
Also, any ideas on what is a good differential between the return air and the supply air? I'm seeing about 9-11. The HVAC installer said that's about right for a heat pump.