Seasonal Energy Efficiency Ratio or SEER, is a way to measure an air conditioner or heat pumps performance during the cooling season. The minimum SEER in Pennsylvania is 13 for A/C and 14 for heat pumps. When considering replacing either, the SEER is only part of the equation, even those minimums will be an improvement on many systems over 10 years old. So, don’t get overly hung-up on a SEER rating, consider all of the other features and benefits and how a system will perform for you and your home.