Buying a new air conditioner? Getting the right size is one of the most important steps. Too small, and your system won’t cool your home effectively. Too big, and you’ll waste energy and money. Let’s break down how to size your AC properly so you stay comfortable without overspending.
Why Size Matters
An air conditioner’s size is measured in tons. One ton equals 12,000 BTUs (British Thermal Units) per hour—the amount of heat it can remove from your home. Your ideal AC size depends on many factors including your home’s square footage, insulation, windows, and climate.
How to Calculate Your Cooling Needs
The easiest way to estimate is by using a Manual J load calculation, a standard method HVAC pros use. This calculation considers your home’s size, orientation, insulation, and more to find the precise cooling load.
Quick Rule of Thumb
For a rough estimate, multiply your home’s square footage by 25 BTUs per square foot.
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Example: A 2,000 sq ft home x 25 BTUs = 50,000 BTUs → About a 4-ton system.
Keep in mind this is just a starting point. For best results, get a professional Manual J calculation done.
Why Oversizing is a Problem
Oversized AC units cycle on and off too frequently, which can cause:
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Higher energy bills
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Uneven cooling
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Increased wear and tear on components
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Poor humidity control
What About Undersizing?
An undersized unit will run constantly and struggle to keep your home comfortable, especially on hot days.
Mike’s Tip: Use Online AC Sizing Calculators
There are great free calculators online where you input your home details to get an estimate. Here’s a reliable one from HVACDirect:
🔗 HVACDirect AC Tonnage Calculator
Next Steps
Once you have your size, check out the R-32 AC and air handler systems at The Furnace Outlet. These systems come in various sizes to fit your home perfectly.
