# How you calculate SEER ratings

So now that you’ve decided you want to calculate your SEER rating and make sure that your HVAC system is energy efficient, how do you do that? The answer is pretty straightforward but it does require a little bit of math.

1. The first step is finding the hourly BTUs of your air conditioner. sometimes this number is on the air conditioner itself. Other times you will have to look into the owner’s manual that came with your air conditioning system.
1. The next step is to find the watts per hour that your air conditioner uses. Once more, this number can either be found in your owner’s manual or on the air-conditioning unit itself.
1. The next step is where it gets a little bit tricky. There are four months in the summer and this equates to approximately 1,000 hours. So we multiply the number of BTUs, from the first step, by 1,000 in order to get the amount of BTUs that your air conditioner uses during the summer season. BTU X 1000 = Y
1. Then, we do the same thing with the watts in order to find the watt hours. So multiple the watts from step to buy 1000 as well. Watt X 1000 = Z
1. Finally, divide the BTUs from step 3 by the number of watt hours in step 4. This will be your SEER rating. Y / Z = (Your SEER rating)