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Mini Split Sizing Guide

How to Properly Size Your Mini Split

Product Expert

Sizing your mini split system correctly is a vital step towards ensuring your comfort.

If it is too small, you'll find yourself wasting energy while your unit runs and runs, all the while never reaching that temperature you desire. This will likely shorten the useful life of your equipment.

If it is too big, you'll spend extra money up front, and will likely experience decreased energy efficiency over the life of your equipment.

Mini Split Sizing Wizard>

How Are Mini Splits Sized?
Mini splits are sized in BTUs (British Thermal Units), which measure the amount of work (physics term) needed to raise the temperature of one pound of water by one degree Fahrenheit.

Sizing ToolTo put that into perspective, 1 BTU is approximately equivalent to a standard 4-inch match burning completely through.

If you give us a call, our experienced engineers are happy to provide a complete, professional sizing for your space at no cost to you. Because of the detailed work involved, these sizings take about 3-5 business days to complete. If you can't wait that long, or would just like a rough sizing estimate so you know where to start, you can click the button above to use our online Mini Split Sizing Wizard.

Our proprietary software will lead you through some brief, yet specific, questions about your space and provide the best sizing estimate you'll find from an online tool. If you're looking to buy a multi-zone system, use the tool once per zone to get sizing estimates for each indoor unit (outdoor unit sizing for multi-zone systems may require additional calculations beyond the tool's capability).

Why Are Some Systems Measured in Tons?
Often times, you'll see central air systems measured in tonnage. While this term sounds like a measurement of weight, it has nothing to do with weight at all. Tonnage is a term used in the HVAC field that describes how much heat the system can remove from the indoor air in one hour.

Mini-splits aren't measured in tonnage as well as central systems because they are sized to smaller spaces. Instead, mini splits are typically measured in BTUs (British Thermal Units). This is a much more universal system of measuring a condenser's ability to heat and cool an indoor area. You can convert tonnage to BTUs (1 Ton = 12,000 BTU) if you'd like to compare the two.

For a more dependable sizing estimate, contact us or use our Mini Split Sizing Guide above.

NEXT: Build Your Perfect Ductless Mini Split System

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