My house was built in 2004 and is about 1900sqft. The builder put in a Duncan 10 seer contractor heat pump. I bought this house in 2007. Since then I have had to replace the defroster switch twice, and now the circuit board burned out on one connection so that that fan always runs. I can get it repaired for about $, but I was considering going up to a 16 seer unit in hopes of lowering my electric bill. I don't know what the manufacturer is, but my repairman can install the unit and coil for $. I understand the seer rating is for air conditioning, but I live in Western PA and need the heat more than AC. I have been searching trying to find advice, but what I find is all dealing with Southern states and A/C. So I am going out to you all, the experts, to help me decide if I should repair or replace. Any advice is greatly appreciated. A side note, we don't plan on being in this house forever, but probably for the next 5 years at least, but it could be 10 years.