Notice: This HVAC calculator provides estimates only and is for informational purposes. Results
should be verified by a licensed HVAC professional. Use at your own risk.
Technical Tool
Mini Split Sizing Calculator (BTU Capacity Tool)
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Enter Zone Parameters — One Row Per Room or Zone
| Room / Zone | Sq Ft | Sunlight | Occupants | Remove |
|---|
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How to Use the Mini Split Sizing Calculator
This mini split sizing calculator determines the correct BTU capacity for ductless mini split systems. Proper mini split sizing is critical — an undersized unit will struggle to maintain comfort, while an oversized unit will short-cycle and fail to dehumidify.
How Many BTUs Does a Mini Split Need?
A common rule of thumb is 20 BTU per square foot for standard residential spaces in a moderate climate. However, this can vary significantly based on ceiling height, sun exposure, and occupancy.
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