I'm renting a small apartment for a couple of months with an AC/heatpump problem. I't a relatively new Carrier system. When it's cold, say 50° or less, in normal mode the compressor runs all the time, and the coils seem to be frozen most of the time I look. The incoming air feels cool, and it's all the system can do to maintain the inside temperature in the mid 60s. If I switch the system to EH (Emergency Heat) mode, the compressor never runs, inside temps are within a couple of degrees of the set point, and the system cycles on and off as I would expect. I suspect that it's costing less in EH mode as well, since the compressor is off. Is this symptomatic of a common problem I could advise the landlord to have fixed, or is it a basic capacity issue? My home system (also recent Carrier, but a lot bigger) doesn't have the problem.