The True Difference Between EER Ratings And SEER Ratings

If you have purchased AC systems or have worked with some for a while, you probably have wondered what the big different between EER ratings and SEER ratings is. These two ratings are used frequently and one substitutes the other at times. But what is the real difference between the two?

The EER Measure

The EER rating (Energy Efficiency Rating) is a system used to measure how many watts of power are used for an AC to produce about 1 Btu/h of cooling power under fixed conditions. The EER ratings were the first ever used system to rate air conditioner efficiency and were appreciated for how simple it was to calculate with it.

However, technicians saw an error in the same system because it did not account for those ACs that took a while to reach peak cooling power when turned on. Thus the EER rating was revised and some changes made to what is a now SEER rating.

The SEER Measure

In full, it is known as the Seasonal Energy Efficiency Rating. This system deviates from the norm of measuring energy efficiency under a constant operating temperature. To calculate SEER ratings, one has to measure how much energy is saved whenever the AC is in the cooling period; these measurements are taken under varying temperatures.

Thus, as EER ratings measure energy efficiency at constant temperature, SEER ratings take the same measurements under different temperature then average the resulting figure.

So Which Should You Use?

The standard way of taking Btu/h ratings is using SEER ratings, though the EER ratings also come to play in a lot of situations. Whichever you choose will depend on the temperature conditions in each season. For example, the EER ratings will be more efficient during summer when the temperatures are at a constant high. On the other hand, in areas where temperatures are moderate and often fluctuate during the day, the SEER ratings will be most accurate.

That is the major difference between EER ratings and SEER ratings. For more information on efficient heating and air conditioning options, feel free to call us today.