Air Conditioner Size Calculator

Find the right AC tonnage for your home. Enter your climate zone and square footage to get an accurate system size recommendation in seconds.

Calculate Your AC Size

See mini splits for rooms under 400 sq ft. Select the region you live in according to the color keyed map below Select the system type needed for your home. Enter the approximate square footage of the area you need to heat or cool (minimum 600 sq. ft.). If your space is under 400 sq. ft., view our Mini Split options.
Click the Calculate System Size button.

Mobile Home Tonnage Disclaimer

This calculator is not accurate for mobile or manufactured homes, which are often upsized by ½ ton to 1 full ton compared to standard site-built homes. If you are sizing a mobile home, we strongly advise not reducing tonnage from what you currently have based on this calculator’s results. This tool is designed for traditional single-family upflow homes, not manufactured housing. Need help? Contact Us

US Regions

Disclaimer:

This calculator provides a general estimate of HVAC tonnage based on climate zone and square footage. It doesn't account for vaulted ceilings, insulation quality, building construction, window size and orientation, or local temperature extremes. Actual requirements vary considerably between homes, so we recommend having a licensed HVAC contractor perform a professional load calculation before purchasing.

Replacing an existing system? Stick with the same tonnage unless you've added square footage, experienced consistent comfort problems, or made major insulation upgrades since the original installation.

Our sales team brings over 40 years of industry experience and can help you work through the details. Contact us here or call 1-813-885-7999 .

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