Understanding Different HVAC Rating Systems

Understanding Different HVAC Rating Systems

One of the toughest parts of purchasing a new HVAC system is dealing with industry rating system jargons like EER, AFUE and SEER. Sadly, many homeowners don’t bother knowing about these rating systems.  Today, we’ll walk you through the different HVAC rating systems to help you come up with smarter decision for your comfort needs.


Energy Efficiency Ratio (EER) refers to the cooling output of your AC unit divided by the electrical power input. EER is measured using a set outdoor temperature set indoor air temperature, and fifty percent relative humidity.


Annual Fuel Utilization Efficiency or AFUE refers to the efficiency of a furnace in covering fuel to energy. Buying a furnace with higher AFUE rating is a wise move because such units are ideally efficient. Talk to your local HVAC contractor for more information.


Shorthand for Seasonal Energy Efficiency Ratio, SEER refers to the cooling output during a typical cooling season divided by the electric energy input during the same period. It’s recommended to purchase HVAC units with higher SEER rating because they are more energy efficient.


Heating Seasonal Performance Factor (HSPF) measures how efficient a heat pump is. HSPF is the ratio of the heat output to the electrical energy consumed over an average heating season. Heat pumps with higher HSPF are considered energy efficient.


Often applied in most air conditioners, one British Thermal Unit (BTU) refers to the amount of heat required to raise or drop the temperature of 1-pound of water by 1-degree Fahrenheit.

Are you ready to buy a new air conditioning or heating system? Know these HVAC industry rating systems for a more educated decision. To learn more about these jargons, don’t hesitate to contact your local HVAC company.