AC Tonnage Formula:
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Definition: This calculator estimates the required air conditioning capacity in tons based on the area to be cooled and the cooling load factor.
Purpose: It helps HVAC professionals and homeowners determine the appropriate AC unit size for a given space.
The calculator uses the formula:
Where:
Explanation: The area is multiplied by the cooling load factor to get total BTUs needed, then divided by 12,000 to convert to tons.
Details: Correct AC tonnage calculation ensures energy efficiency, proper humidity control, and system longevity. Oversized units short-cycle, while undersized units run constantly.
Tips: Enter the area in square feet and cooling load factor (default 25 BTU/hr/ft²). For residential spaces, typical values are 20-30 BTU/hr/ft².
Q1: What's a typical cooling load factor for homes?
A: For residential spaces, 20-30 BTU/hr/ft² is common (25 is a good average). Hot climates or sun-exposed areas may need higher values.
Q2: Why divide by 12,000?
A: One ton of cooling equals 12,000 BTU per hour, the standard measurement for AC capacity.
Q3: Should I round up the calculated tonnage?
A: AC units come in standard sizes (1.5, 2, 2.5, 3, etc. tons). Round to the nearest standard size, considering other factors like insulation and climate.
Q4: What factors affect cooling load?
A: Insulation, windows, ceiling height, sunlight exposure, occupancy, and appliances all impact cooling requirements.
Q5: Does this calculator account for humidity control?
A: No, for humid climates, you may need additional capacity for proper dehumidification.