Homeowners in warm to moderate climates have enjoyed the energy efficiency of heat pumps for decades. Heat pumps have many advantages over traditional gas or electric furnaces and air conditioning units. Instead of two separate systems, a heat pump does the job of both. But if your system is 10 to 15 years old, now may be the right time to consider replacing it — and here are several reasons why. SEER Rating The Seasonal Energy Efficiency Ratio, or SEER, is a measure of how efficient your heat pump is at