May 21

Sizing Your Air Conditioner: How to Choose the Right Size AC Unit for Your Home


When it comes to air conditioning, size matters. If you’re looking to purchase a new central air system for your home, or perhaps upgrade from an older model, it’s important to choose the right size AC unit for your home.  

An air conditioner that’s too small will have to run non-stop to keep your home cool during the summer, drastically increasing your monthly bills. On the other hand, if the AC unit is too big it can cool the home too quickly, causing it to run on very short cycles and then failing to remove humidity from your home. In either case, your air conditioner may wear out faster.

sizing your air conditionerCentral AC units come in a variety of different sizes and are measured in tons. The unit “ton”, however, doesn’t relate to the weight of the unit, but instead, to the unit’s ability to cool your home. For example, a one-ton AC unit will be able to cool 12,000 British Thermal Units (BTUs) in one hour. A two-ton unit will be able to cool 24,000 BTUs an hour, and so on.  

There are a few things to keep in mind when choosing the correct size AC unit for your home:


Size of Your House

Naturally, the size of your house is the biggest factor when it comes to the size of air conditioner you need. It makes sense that a larger house will need a larger AC unit to cool it. In fact, there is a simple mathematical formula you can use to help calculate the size of air conditioner that will best fit your home.

The equation looks like this:

((House square footage x 25/12000)-0.5)

This might look complicated at first, but it’s actually pretty simple. Let’s say you have a 2000-square-foot home. You’ll plug in your number and get this ((2000×25/12000)-0.5). 2000 times 25 = 50000  50000 divided by 12000 = 4.16  4.16-0.5=3.66

So, for a 2000-square-foot home, you’d be looking at purchasing a 3.5 ton AC unit.

However, keep in mind that this equation only gives you a rough estimate of the size of the AC unit you will need. While this is a great guideline to start with, there are a few other things to keep in mind besides just the square footage of your home.


Natural Sunlight

Does your house get a lot of sunlight? Or is it very shady? Which direction do your largest windows face? A house that gets a lot of sunlight may need more cooling power than a naturally shady space.


Ceiling Height

A 2000-square-foot home with low ceilings will differ greatly from a 2000-square-foot home with very high ceilings in terms of the amount of space needed to cool.



The area where you live will help determine what size air conditioner you will need. Do you get very hot summers or is it milder? Is it very humid or dry?



The existing ductwork in your home can help determine what size unit you can purchase.  Installing a unit that’s too large for your current heating ducts will result in inefficient cooling.

As you can see, there are several factors to keep in mind when choosing which size AC unit is right for your home, and it can be tricky. Installing a central air unit is a big undertaking and the wrong size will affect your energy bills and the efficiency of your unit. Often, getting a professional opinion will be beneficial to ensure you get the most out of your purchase.


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Some Of Our HVAC & Plumbing FAQs


We recommend an annual cleaning for best performance and maintenance.


Every 3 years is a good schedule to follow. For new construction homes, we do recommend a cleaning right away due to construction dust and debris.


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Whether you are dealing with a plumbing or HVAC issue in Transcona, Lynn's is here to help. We have technicians standing by to help you repair, service or install new plumbing and HVAC equipment from hot water tanks, sewers, air conditioners, furnaces and more. after all... YOU DESERVE TO FEEL COMFORTABLE IN YOUR OWN HOME!

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Colin Roch
Colin Roch
September 27, 2022.
Our water tank quit on us Saturday night. Contacted Lynn’s the next day for a quote and they scheduled us in first thing Monday morning. Service was quick, efficient and price is very competitive, would highly recommend.
RD Baxter
RD Baxter
September 22, 2022.
If you need a company for any plumbing needs please make sure to use Lynne‘s HVAC Winnipeg. Scott was out today to clean our sewer line and he was very professional & had everything back working for us again. It seems tree roots were the cause of our troubles. I would rate Scott and the company both five stars. ⭐️⭐️⭐️⭐️⭐️
August 27, 2022.
From the moment I met Josh I knew I could trust this company. He was very patient and explained everything easily. The team came on time. They worked so hard to get my new AC on my old furnace. It was a challenging job but they stayed positive and never discouraged me. I was so confident they will do a great job and they did not disappoint. They cleaned up everything and it looked perfect. I am now enjoying my cool home. Thank you so much and I feel like I found a family. ❤️
Rafael D
Rafael D
August 25, 2022.
After a really bad experience with a competitor I turned to Lynn’s. Scott was early, clean and professional. He took of his shoes, prepared the area where we has going to work and made sure my carpet didnt get any more dirty then it was (competitor had soiled it). The jobs was tougher than initially thought, but Scott kept working at it and didn’t give up and finally found a solution. I felt the costs was proportionate and I would highly recommend Lynn’s Plumbing and Scott in particular. Give others a pass!
Jana Jordan
Jana Jordan
August 23, 2022.
Sucks to be without AC when it is 30 degrees out! Luckily Lynn’s helped us repair our air conditioner unit within hours of it breaking down.


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Our Winnipeg, Manitoba Service Areas

At Lynn's we are proud to service customers throughout Winnipeg and the surrounding areas with their plumbing & HVAC needs. You will likely see our pink trucks in the following places:

Our Winnipeg, Manitoba Service Areas

At Lynn's we are proud to service custsomers throughout Winnipeg and the surrounding areas with their plumbing & HVAC needs. You will likely see our pink trucks in the following places:

a few of the many neighbourhoods we serve in winnipeg for their hvac needs

Island Lakes


Waverley Heights

Richmond Lakes

Sage Creek

West Kildonan


Richmond West

Riverpark South

Bona Vista


West Dale

Windsor Park

Mission Gardens


Our Manitoba HVAC Services

  • Winnipeg
  • Oakbank
  • Ile Des Chênes
  • Niverville
  • Ste. Francois Xavier
  • Landmark
  • Headingley
  • Oak Bluff

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A Few of the Many Areas We Serve in Winnipeg for their HVAC Needs

East Winnipeg

  • Transcona
  • East St. Paul
  • West St. Paul
  • East Kildonan
  • North Kildonan
  • River East
  • St. Boniface
  • St. Vital
  • Southdale
  • Elmwood
  • Downtown
  • Fort Richmond
  • Wildwood
  • Springfield
  • Rossmere
  • Dakota

West Winnipeg

  • Garden City
  • Wolseley
  • River Heights
  • Tuxedo
  • Charleswood
  • Linden Woods
  • Bridgewater
  • St. James
  • Maples
  • West End
  • Westwood
  • Tyndall Park
  • South Pointe
  • Silver Heights
  • Whyte Ridge
  • Waverley West