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What Size System Do I Need?
Why Is Ductless Heat Pump Sizing So Important?

Proper ductless air conditioner sizing is essential for high efficiency performance and the level of cooling capacity. If the sizing is too small or too large, the system won't cool properly, and it won't operate efficiently. And if the system is improperly sized, if the indoor units are mounted in the wrong locations, or the installation itself is done incorrectly, you'll be left with an expensive problem to fix. Systems that are incorrectly sized and improperly positioned can seriously interfere with humidity control and cost a bundle in high electric bills.

Sizing a split system will depend on existing insulation levels, the area you want to cool and on how many indoor air handlers you plan to include. The more indoor units you want, the more precise the sizing must be. Because you're investing in a high performance system, technicians recommend professional sizing and installation. That way, you'll know the job will be done properly and that your investment will be protected.

Ductless splits cool a larger area at the same BTU level than do window air conditioners and portable air conditioners. Below is an approximate sizing guide:

350 square feet =   9,000 BTU

500 square feet =   12,000 BTU

750 square feet =   18,000 BTU

1000 square feet = 24,000 BTU

1250 square feet = 30,000 BTU

1500 square feet = 36,000 BTU