Understanding HVAC System Efficiency Ratings

Efficiency ratings are worth looking into when choosing an energy-efficient and cost-effective HVAC system for your home. They measure the energy efficiency of different heaters, air conditioners and other comfort equipment, directly impacting your energy usage and costs. In this post, Perfect Degree HVAC takes a look at some of the most important HVAC efficiency ratings.

SEER Ratings: Measuring Cooling Efficiency

Seasonal Energy Efficiency Ratio (SEER) measures a central air conditioning system’s efficiency over a typical cooling season. It’s calculated by dividing the total cooling output (in British Thermal Units or BTUs) by the total electricity usage (in kilowatt-hours). In simple terms, a higher SEER rating means better energy efficiency and lower energy costs. While older systems may have SEER ratings of 6 or less, modern air conditioners typically have SEER ratings of up to 25.

EER Ratings: Understanding Energy Efficiency

The Energy Efficiency Ratio (EER) is another measure of cooling efficiency, but unlike SEER, it’s calculated based on a specific outdoor temperature (usually 95 degrees Fahrenheit), rather than an entire season. EER is calculated by dividing the cooling output by the power input at this specific temperature. It’s particularly useful in consistently hot climates where air conditioning systems operate at peak load for extended periods. Higher EER ratings indicate greater efficiency.

HSPF and AFUE Ratings: Gauging Heat Pump and Furnace Efficiency

The Heating Seasonal Performance Factor (HSPF) measures the efficiency of heat pumps. It’s calculated by dividing the total heating output over a heating season by the total electricity used during the same period. Higher HSPF ratings signify more efficient heat pumps.

The Annual Fuel Utilization Efficiency (AFUE) rating, on the other hand, measures the efficiency of gas or oil furnaces. It represents the percentage of fuel burned that is actually converted into heat, with the rest being lost in the combustion process. An AFUE rating of 90% means 90% of the fuel is utilized for heat while 10% is wasted.

Understanding these efficiency ratings is vital when choosing a new HVAC system. To help you make an informed decision based on these important pieces of HVAC information, the experts at Perfect Degree HVAC are always here to help. Call us today at (610) 529-7372, or fill out this contact form to get started.