1. What is an AC Tonnage Calculator?

Definition: This calculator estimates the HVAC system tonnage required based on cooling capacity in BTU/hr.

Purpose: It helps homeowners and HVAC professionals determine the appropriate size of air conditioning units for spaces.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — AC tonnage (tons)
• \( BTU \) — Cooling capacity (BTU per hour)

Explanation: One ton of cooling equals 12,000 BTU per hour. The formula converts BTU requirements to standard HVAC tonnage.

3. Importance of Proper AC Tonnage Calculation

Details: Correct tonnage ensures energy efficiency, proper cooling, and prevents system overwork or short cycling.

4. Using the Calculator

Tips: Enter the cooling capacity in BTU/hr (typically 20 BTU per sq ft for moderate climates). Value must be > 0.

5. Frequently Asked Questions (FAQ)

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/24h = 12,000 BTU/h).

Q2: How do I estimate BTU requirements?
A: A rough estimate is 20 BTU per sq ft, but consider insulation, climate, windows, and occupancy for accurate sizing.

Q3: What happens if my AC is oversized?
A: Oversized units cool too quickly, leading to humidity problems and frequent on/off cycling that reduces efficiency.

Q4: Can I use this for heat pumps?
A: Yes, the same calculation applies to heat pump cooling capacity.

Q5: What's typical for residential homes?
A: Most homes need 1.5-5 tons, with average around 3 tons for a 2,000 sq ft home in moderate climates.