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In this modern age, having an AC in your home is less a luxury than it is standard. But since the world has changed dramatically in the last few decades, it may very well be time to replace that old AC and have a modern one installed. You may not be aware of the fact that air conditioning units have changed quite a bit over the past 30 years, and the size/age of the unit you have now may be causing your electricity bill to be much higher than it needs to be.

Before you begin your quest to purchase a new AC, there are a few things that you’ll need to understand. Centralized air conditioning units come in a variety of different sizes ranging from 1-ton to 5-tons. This doesn’t have anything to do with how much the machines weigh. Instead, the unit “ton” is in relation to your AC’s ability to cool. A 1-ton AC unit will be able to cool 12,000 BTUs (British Thermal Units) in an hour.

Don’t let us lose you, we know it’s getting a little complicated. With a bit of brain power, it is fairly simple to understand this stuff. It is helpful to know that anything over a 5-ton unit is usually going to be for commercial properties. So while looking for a unit for your residential home, it will be best to keep your search between the 1-5 range.

Now you know about tons and BTUs, but you still don’t know how that will help you determine what size is best for YOUR home. There are a few different ways to make that determination, and some of those tactics can get pretty complicated. Having that said, we encourage you to talk to a professional HVAC contractor if you are looking to get the most specific results.

Using a simple math equation, you can calculate the size of AC unit that will best fit your home. The equation looks like this: ((House square footage times 25, divided by 12,000) – 0.5) = required tons. So let’s say your house is 2,000 sq. ft. You will multiply 2,000 by 25, equalling 50,000. You will then take 50,000 and divide it by 12,000, equalling about 4.1. You’ll then subtract 0.5 from 4.1, equalling about 3.6. From all that, we can deduce that a 2,000 sq. ft. home needs a 3.5 ton AC unit.

Keep in mind that these calculations are only going to give you rough estimates of what you need. If you really want a specific and precise calculation, you are going to want to contact a professional.

All in all, it is important that you keep a cool head, even if your AC unit isn’t running right now. There are quite a few factors involved when calculating the size of AC you’ll need, and rushing through the process because you want to “get it over with” is risking making the wrong decision. If you do end up with the wrong size, it will still keep your house cool, but will either be working too hard, or not efficiently. Both of those things are going to cost you more money on that electricity bill.

Arco Comfort Air would be glad to help you in your decision making. We have a capable team of technicians and experienced professionals that are willing to give you advice! If you find yourself stressing about this, or if you are only interested in getting specific results, give us a call and we will do our best to get you set in the right direction.

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What Are Customers Are Saying

Preston Gordon you are the man. Thank you for fixing bathroom and finding my lost hidden treasures.

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Katie Lock

Katie Lock

July 24, 2026

Thank you for the great and friendly service Shavine. I appreciate all the advice and friendly attitude.

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Christen Keith

Christen Keith

July 23, 2026

Princeton was amazing. He diagnosed the issue quickly and solved it without fail. Would recommend.

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William Keys

William Keys

July 23, 2026

Cliff did a great job with my emergency breaker job he was quick and dedicated to getting it done to helping me restore my power. I really appreciated the swift response.

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Derek Murphy

Derek Murphy

July 22, 2026

Reggie was absolutely fantastic. Very knowledgeable and explained everything in simple terms. Would definitely recommend him for any of your electrical needs!

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Christian Mayfield

Christian Mayfield

July 21, 2026

Princesten was wonderful! He was very thorough, helpful and extremely professional. We have had many service professionals come through our home and he is by far one of the most professional and respectful people I’ve ever had.

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Elisa Race

Elisa Race

July 20, 2026

Amazing work today by Evan and Shavine. They were able to fix a problem no one else was able to fix. Will definitely use these guys again

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Darren Eaddy

Darren Eaddy

July 20, 2026

Shavine and Evan were very knowledgeable and were able to fix the issue at hand . They answered all our questions and made sure everything was complete before they left .

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Char E

Char E

July 20, 2026

Outside GFI outlet not working. Could not reset. Within a short time problem was resolved. Electrician Shavine was excellent. I would highly recommend Arco and their service provided.

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Bob Ochsner

Bob Ochsner

July 20, 2026

We originally called Acro for one issue but ended up with getting our very out dated breaker boxes replaced which was definitely needed. Shavine M. and Evan S. were both our electric technicians for our full job. Shavine M. was the first technicians on site and was very prompt. The gentlemen let us know before hand the amount of time the power was going to be out and we gave them the space to work. After the work was completed, Shavine gave a walk through of the work completed today and a explaination of the next steps after. We are very happy with the work completed and Shavine and Evan were a pleasure to have as technicians on the job.

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Jasmin A

Jasmin A

July 18, 2026

Great experience! Quote and installation/service performed same day when others were weeks out just for quote appointment. We had an attic vent fan hooked up and some landscape lighting repaired, but seems they could really do any/all electrical projects you would need.

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Marc Mellion

Marc Mellion

July 16, 2026

Andrew Corrothers with Arco was very polite and answered questions that I had when he came for my A/C maintenance.

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Sherry Runner

Sherry Runner

July 15, 2026

Shavine switched out/repaired more outlets and switches in our home than I can count! He also installed several light fixtures for us and they work and look outstanding ! Now all of our lights and outlets are functional and I am so happy with the work that was done . It was a very big job and Shavine worked finished it all in a day ! I highly recommend Shavine with your electrical needs!

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Susan Simpson

Susan Simpson

July 13, 2026

We had our AC serviced by Arco. The first day we had a technician. He said he had to order parts and would return the next day. The next day we got a new technician EUGENE and he was so professional, h shared what he was doing, he was friendly, and insightful. We had to replace our thermostat. He was quick and proficient. I highly recommend Arco but specifically Eugene. Thank you.

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Tamika Glenn

Tamika Glenn

July 11, 2026

They are reliable and always show up as scheduled. Shavine did a great job installing our motion sensor floodlights. I would hire them again for any electrical work.

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Kern Jolibos

Kern Jolibos

July 10, 2026

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