Replaced my 13 year old Heil R22 heat pump a few years ago with Rheem R410a. Not one of the real high SEER models, mine is the top model that is a conventional unit. So far, no complaints, does what it should, haven't had to do anything to it. I do clean the evaporator coil in the spring and again in the fall. The condenser stays clean. I think this helps. I also have a "roof" over the condenser until to keep snow and ice from building up on it. That can cause real damage to the fan.
