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AC Tonnage Formula:
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AC tonnage calculation converts cooling capacity from BTU/h to tons of refrigeration. One ton of refrigeration equals 12,000 BTU/h, which represents the amount of heat needed to melt one ton of ice in 24 hours.
The calculator uses the simple formula:
Where:
Explanation: This conversion helps HVAC professionals and homeowners determine the appropriate air conditioning unit size for a space based on its cooling requirements.
Details: Proper AC tonnage calculation is essential for selecting the right-sized air conditioning unit. An undersized unit will struggle to cool the space, while an oversized unit will cycle on and off too frequently, reducing efficiency and increasing wear.
Tips: Enter the BTU/h value of your cooling load. The calculator will automatically convert it to tons of refrigeration. For accurate results, ensure you have a proper cooling load calculation before using this converter.
Q1: Why is 12,000 BTU equal to one ton?
A: This measurement dates back to when cooling was provided by melting ice. One ton of ice melting over 24 hours absorbs 12,000 BTU of heat per hour.
Q2: How many square feet does one ton of cooling cover?
A: Approximately 400-600 square feet, but this varies based on climate, insulation, ceiling height, window area, and other factors.
Q3: Can I use this for heat pump sizing?
A: Yes, the same tonnage calculation applies to heat pumps in cooling mode.
Q4: What's the difference between BTU and tonnage?
A: They're different units measuring the same thing (cooling capacity). BTU is the fundamental unit, while tons are a derived unit specifically for refrigeration.
Q5: Should I round up when selecting AC unit size?
A: It's generally recommended to round to the nearest standard unit size (1, 1.5, 2, 2.5, 3, 3.5, 4, 5 tons) but consult with an HVAC professional for specific recommendations.