Home
Back
HVAC Tonnage Formula:
| From: | To: |
The HVAC ton per square foot calculation helps determine the appropriate cooling capacity needed for a space. One ton of cooling equals 12,000 BTU per hour, and the required tonnage is calculated by dividing the area by a factor that represents square feet per ton.
The calculator uses the formula:
Where:
Explanation: The factor varies based on climate, insulation, window area, and other factors that affect cooling load.
Details: Proper HVAC sizing is crucial for energy efficiency, comfort, and system longevity. Oversized units short cycle, reducing efficiency and humidity control, while undersized units struggle to maintain temperature.
Tips: Enter area in square feet and an appropriate factor (typically 400-600 sq ft/ton). For more accurate results, consult an HVAC professional who can perform a Manual J calculation.
Q1: What is a typical factor value?
A: For residential applications, a factor of 400-600 square feet per ton is commonly used, with 500 being a standard average.
Q2: Why does the factor vary?
A: The factor varies based on climate, insulation quality, window area, ceiling height, number of occupants, and heat-generating appliances.
Q3: Is this calculation accurate for all situations?
A: This is a rough estimation. For precise sizing, professionals use Manual J calculations that consider all factors affecting cooling load.
Q4: What if I have high ceilings or many windows?
A: Spaces with high ceilings, large window areas, or poor insulation may require a lower factor (more tons per square foot).
Q5: Can I use this for commercial spaces?
A: While the basic formula applies, commercial spaces often have more complex requirements and should be evaluated by HVAC professionals.