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Mini Split Room Sizing Guide

How to Properly Size Your Mini Split

By  |  Product Expert

If you're looking to upgrade your home's comfort, then getting the right-sized mini split system is the most important step.


Mini Split with Inverter TechnologyMini splits are extremely efficient thanks to their inverter technology that enables your system to generate only the amount of heating or cooling needed to maintain the desired temperature. Even so, you'll want to ensure the system is properly sized for your home.

Although energy-efficient, if the system is too small, you'll find yourself wasting energy while your unit runs continuously, all the while failing to keep you comfortable in extreme conditions. This lack of performance will leave you on the hunt, yet again, for a better solution.

On the other hand, if the system is too large, you'll spend more on equipment and throw any energy savings out the window. Oversized equipment will also fail

prematurely due to short cycling (turning on and off frequently).

The bottom line is this: Improperly-sized equipment leads to decreased comfort, lower efficiency, increased service costs, and premature failure.


How to Size Your Mini Split
Sizing Tool

Mini splits are sized in BTUs (British Thermal Units), which measures the amount of heat needed to raise the temperature of one pound of water by one degree Fahrenheit.


Call us today and 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, click to our free sizing tool at the end of this article.

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 because they are sized for smaller spaces. Instead, they 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.


Get Sizing

Now that you know the basics of sizing, take the next step by using our free sizing calculator.


arrow Next: Use Our Free Mini Split Sizing Calculator


Mini Split Buyer's Guide Navigation
Home | Inverter Technology | Efficiency | Dehumidification | Heat Pumps vs A/C | Winterizing | Single-Zone vs Multi-Zone | How To Zone | Indoor Units | Accessories | Find an Installer | Room Sizing Tool | System Builder


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