Why is the SEER rating on the Energy Guide different from what my dealer quoted?

Each split system cooling unit has a nominal SEER rating. For a higher rating your HVAC contractor can provide advice about an upgrade. The SEER rating of a system is based on the combination of equipment installed in the home. The outdoor equipment (heat pump or air conditioner), as well as the indoor equipment (evaporator coil and furnace, or air handler), play a vital role in the total rating.