HVAC Tonnage Formula:
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Definition: This calculator converts cooling capacity in BTU/hr to HVAC tonnage, the standard measurement for air conditioning systems.
Purpose: It helps homeowners and HVAC professionals properly size air conditioning units for residential properties.
The calculator uses the formula:
Where:
Explanation: One ton of cooling equals 12,000 BTU per hour. The formula converts BTU rating to standard tonnage.
Details: Correct sizing ensures energy efficiency, proper cooling, and system longevity. Oversized units short-cycle, while undersized units can't maintain temperature.
Tips: Enter the cooling capacity in BTU/hr (found on your AC unit's specification plate). The value must be > 0.
Q1: Why 12,000 BTU per ton?
A: This standard comes from the amount of heat needed to melt one ton of ice in 24 hours (288,000 BTU/24 hr = 12,000 BTU/hr).
Q2: What's a typical tonnage for a home?
A: Most homes need 1-5 tons (12,000-60,000 BTU), with about 1 ton per 400-600 sq ft depending on climate and insulation.
Q3: How do I find my AC's BTU rating?
A: Check the model number (often contains BTU info) or nameplate on the outdoor unit.
Q4: Should I round up the calculated tonnage?
A: HVAC systems come in standard sizes (1, 1.5, 2, 2.5, etc. tons). Round to nearest standard size, considering climate factors.
Q5: Does this account for climate differences?
A: No, this is a basic conversion. Actual sizing should consider local climate, insulation, and home characteristics.