AC Size & Tonnage Calculator Burlington, ON
Proper sizing is the single most overlooked factor in AC performance.
Find the right tonnage for your Burlington home — not too big, not too small.
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A/C Size Calculator
This short quiz is designed to help homeowners estimate the correct central air conditioning system size and BTU rating for your home.
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📐 Size Calculated
Your Recommended AC Size
Recommended Tonnage
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BTU Output
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Get a Confirmed Size from a Pro
A certified HVAC contractor performs a Manual J load calculation for exact sizing.
Get Free QuotesWhat Size AC Does a Burlington Home Need?
Square footage gets you in the right neighbourhood, but Burlington's specific climate demands more nuance. An AC Size Calculator Burlington homeowners use can estimate cooling requirements, but the city's lakeside location moderates temperatures somewhat compared to inland Ontario, while summer heat waves still push design temperatures to 31°C — and the humidity makes it feel hotter. A house in Burlington with older windows facing west will need meaningfully more cooling capacity than a newer, well-insulated home of the same size.
Choosing the correct system size is also important when estimating installation costs, so homeowners planning a replacement can review our New AC Installation Cost Burlington guide for additional budgeting insights.
Factors such as insulation levels, window exposure, ceiling height, and occupancy can also influence the ideal AC size, which is why this calculator should be used as a starting point rather than a final sizing recommendation. For additional guidance, review the recommendations from ENERGY STAR.
The table below gives general starting points. Our calculator refines these using insulation level, ceiling height, window exposure, and occupancy.
| Home Size (sq ft) | Starting Estimate | BTU/h Range |
|---|---|---|
| 700 – 1,000 | 1.5 tonnes | 18,000 BTU/h |
| 1,000 – 1,400 | 1.5 – 2 tonnes | 18,000 – 24,000 BTU/h |
| 1,400 – 1,900 | 2 – 2.5 tonnes | 24,000 – 30,000 BTU/h |
| 1,900 – 2,500 | 2.5 – 3 tonnes | 30,000 – 36,000 BTU/h |
| 2,500 – 3,200 | 3 – 3.5 tonnes | 36,000 – 42,000 BTU/h |
| 3,200 – 4,200 | 3.5 – 5 tonnes | 42,000 – 60,000 BTU/h |
*Estimates for average Burlington home construction. Older homes, high ceilings, or large south/west-facing windows may need additional capacity.
Why Oversizing Is a Real Problem in Burlington
Burlington summers are humid. That matters enormously for AC sizing. An oversized AC reaches your thermostat's set temperature quickly — but it doesn't run long enough to pull moisture out of the air. The result is a home that reads 22°C on the thermostat but feels clammy and uncomfortable. Dehumidification requires sustained run time, which only a properly sized system delivers. This is one reason why manual J load calculations exist rather than simple square-footage rules.
If you're planning a new system, proper sizing should always be considered before installation, which is why many homeowners use our AC Installation Burlington guide to understand the process and available options.
On top of comfort, oversizing shortens equipment lifespan. Short-cycling — frequent start-stop cycles — strains the compressor and accelerates wear. A 3-tonne AC that short-cycles in a 1,600 sq ft home may need replacement years earlier than a correctly sized 2-tonne unit would.
If you're considering an AC replacement in Burlington, proper sizing is one of the most important factors in maximizing system lifespan and efficiency.
📏 Square Footage
The starting point — but measure only the conditioned (cooled) living space. Don't include uncooled garages or unfinished basements.
🌡️ Burlington's Climate
Summer design temp: ~31°C. Humidity adds effective cooling load beyond what dry-bulb temperature alone suggests. Burlington's lake proximity offers some relief but not on peak heat days.
🏗️ Insulation & Age
Homes built before 1990 often have R-12 or lower wall insulation. Upgrading to R-20+ can reduce cooling load by 20–25%, meaningfully shifting your tonnage requirement.
🪟 Windows & Orientation
West-facing windows take the full force of afternoon sun. A Burlington semi-detached with large west-facing windows may need 0.5 tonnes more than the same floorplan facing north.
📐 Ceiling Height
Standard 8-foot ceilings are the baseline. Vaulted or 10-foot ceilings increase the air volume that needs cooling — push toward the upper end of the range.
👥 Occupancy & Appliances
Each person adds ~250 BTU/h of heat load. Open-concept kitchens, home offices with multiple computers, and home gyms all increase the effective cooling requirement.
Burlington vs. Other Ontario Cities — Sizing Impact
Burlington's location near Lake Ontario places it in a moderate position compared to other southern Ontario cities. Windsor and London tend to be hotter; Ottawa spikes higher but also has colder winters. Here's how Burlington compares for sizing purposes. Even the best temperature to set your AC won't deliver optimal comfort if the system is oversized or undersized for your home.
| City | Summer Design Temp (°C) | Sizing vs. Burlington |
|---|---|---|
| Windsor, ON | 33°C | +12% larger needed |
| London, ON | 32°C | +8% larger needed |
| Toronto, ON | 31°C | Similar to Burlington |
| Burlington, ON | 31°C | — Baseline — |
| Hamilton, ON | 31°C | Similar to Burlington |
| Ottawa, ON | 30°C | ~4% smaller possible |
Frequently Asked Questions
My neighbour has a 3-tonne AC in the same size house. Should I get the same?
Not necessarily. Homes of the same size can have different cooling needs based on insulation, window exposure, and orientation. A neighbour's system can be a useful reference, but it shouldn't replace a proper sizing calculation for your home.
What is a Manual J calculation and do I need one?
Manual J is the industry-standard method for calculating a home's cooling load. It considers factors like insulation, windows, and local climate to determine the right AC size. Most reputable HVAC contractors include a simplified Manual J assessment when providing a quote.
Can I just replace my existing AC with the same tonnage?
Often yes, if your current system has performed well. However, if the existing unit was oversized or undersized, matching its tonnage may repeat the same comfort and efficiency problems. Proper sizing is always worth confirming before replacement.
Want a Proper Manual J Done for Your Home?
Our Burlington technicians include a full sizing assessment with every quote.