Many homeowners think that if they want to know about energy efficiency they only need to look at the Seasonal Energy Efficiency Ratio (SEER). This metric shows how much cooling your system puts out for each unit of energy consumed. In theory, it tells you how efficiently your air conditioning operates. Values range from 8 to a maximum of 30 and the higher the rating, the more efficient your air conditioning unit. But this is just one of the many factors you should consider when purchasing a new air conditioning unit. Here is what you need to know.
What is the SEER Rating?
This metric is determined by the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) to ensure heating and air conditioning systems are safe, productive, environmentally friendly, and efficient. It is the ratio of cooling output divided by the energy consumed over a typical cooling season. It is an average determined by maintaining a constant indoor temperature at a variety of outdoor temperatures ranging from 60 to 100 degrees. But these numbers can be misleading.
It helps to think of a SEER rating like the MPG on your car—basically an indication of the maximum potential. But the true MPG of your vehicle depends on your driving habits and other conditions. The same goes for the SEER rating on your air conditioning. If you constantly change temperatures in your home, or if it is scorching in the middle of the day and cool in the evenings, you will not always meet the SEER value outlined on your unit.
What is the EER Rating?
Another rating to watch for is the Energy Efficiency Ratio, an older means of measuring energy efficiency. This is calculated by dividing the actual cooling per hour and dividing it by the watts of electricity. This measurement comes from a more controlled environment, not accounting for seasonal variations. It uses a constant outside temperature of 95 degrees, instead of variable temperatures.
Where is the SEER and EER Rating Located?
Most air conditioners have a label called the “Energy Guide.” It is a yellow sticker that displays the SEER rating. You can also find it listed with the model and serial number. Look at the beginning digits of the model number and it should tell you the SEER rating.
Which Rating Should I Use to Determine Efficiency?
EER ratings are often used for smaller air conditioning units. But it can also be a better metric for more arid climates where temperatures are high and don’t fluctuate very much. SEER ratings are the most common to compare air conditioning units directly, especially larger central units. You will want to find the equivalent SEER rating for your climate zone and make the best decision based on that information. Prior to the year 2015, the minimum SEER rating for residential heating and cooling systems was 13, regardless of location in the United States. Now things have changed. The acceptable minimum SEER rating depends on your area. The nation is broken down into three regions based on climate. For the Southwest region, which includes San Jose, CA, the minimum SEER rating is 14.
What if my Air Conditioner isn’t Up to the New Standard?
While the new guidelines went into effect in January of 2015, heating and cooling professionals were allowed to sell off their old, non-compliant inventory up until June of 2017. That is why it is so important to make sure your heating and air conditioning units meet the new standard for your region. To find out if your current air conditioning unit meets the new standards, contact Pelle Heating & Air Conditioning at (669) 219-8957. Or you can talk with one of our experts when you stop by 1045 N 10th St., San Jose, CA 95112.
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