particles from 3 to 10 microns in size. Matching Your System for Optimum Efficiency One additional factor that affects the efficiency of your air conditioning or heat pump system... the ideal Carrier system, you will encounter several important industry-standard efficiency ratings. The higher efficiency your product, the lower your long-term energy costs... will be. And as always, Air Design Heating and Cooling can help you choose the heating and cooling products that are right for you. SEER SEER (Seasonal Energy Efficiency Ratio) is the measure...