Mini Split Sizing BTU Calculator

Use this Free & Easy Mini Split BTU Calculator to Select the Right Size Mini Split AC or Heat Pump for your Home.

Select the Right Capacity

This handy mini split sizing calculator will help you select the right system on an efficient room-by-room basis. Always take in to account your climate, insulation, excessive glass and other relevant factors. Rooms with conditioned space above them require less cooling than rooms upstairs that have attic space above them. Always adjust for poor insulation, excessive or drafty windows, etc. when sizing your mini split ac or heat pump.

Choose Adjustment Factor:	.70 .75 .80 .85 .90 .95 1.00 1.10 1.20 1.25 1.50
Room Length:
Room Width:

Based on the information you supplied, your room requires at least  BTU's.

Please visit our Residential or Commercial product pages to find a system for your home or business.

When using a mini split sizing calculator for rooms below a conditioned space, apply an additional .7 factor to your final Btu outcome.

For example, if your Btu requirement via this calculator is 18,000 Btu's: 18,000 Btu's x .7 factor = 12,600 Btu's required. When in doubt, it is okay to go up a size or two. Unlike standard non-variable systems, The mini split inverter technology allows the system to adjust to the actual room requirements in both heating and cooling.

Many mini splits today will provide as little as 30% of the rated capacity when the demand is low, so oversizing is no longer an issue. With standard central air conditioning and heating systems, you must carefully match the air delivery with the room requirements.

Ordinary central air conditioning systems are normally sized based on an outdoor temperature of 93° Fairenheit. When the outdoor temperature exceeds 93°, the system struggles to keep up. When the temperature is significantly lower, the system can short-cycle, meaning it cools quickly without the proper run time for thorough dehumidification. Either way, this is a significant short-coming of non-variable-capacity central systems.

The advanced INVERTER-driven compressor at the heart of of most mini split systems provides variable capacity control for the compressor, slowing the system to adjust to the specific room-by-room demands of the interior space as needed – not the hard start and stop of a traditional system in most homes. Call our Personal Advisors toll-free at 1-866-862-8922 with questions