1. What is an AC Tonnage Calculator?

Definition: This calculator converts cooling capacity in BTU/hr to HVAC system tonnage.

Purpose: It helps determine the appropriate size (in tons) of an air conditioning system needed for a space.

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/hr. Dividing the total BTU by 12,000 converts cooling capacity to tons.

3. Importance of Proper Tonnage Calculation

Details: Correct tonnage ensures energy efficiency, proper cooling, and system longevity. Oversized units short-cycle, while undersized units run continuously.

4. Using the Calculator

Tips: Enter the cooling capacity in BTU/hr (found on equipment specs or calculated from room size). The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why 12,000 BTU per ton?
A: This originates from the amount of heat needed to melt one ton of ice in 24 hours (288,000 BTU/24hr = 12,000 BTU/hr).

Q2: How do I determine my BTU needs?
A: Use our BTU Calculator or the rule of thumb: 20 BTU per sq.ft. (adjust for climate, insulation, etc.).

Q3: What's a typical residential AC tonnage?
A: Most homes use 1.5-5 ton systems (18,000-60,000 BTU), depending on size and location.

Q4: Should I round up the calculated tonnage?
A: HVAC systems come in standard sizes (0.5 ton increments). Round to nearest standard size after calculation.

Q5: Does this account for heat load factors?
A: No, this converts BTU to tons only. Proper sizing requires a Manual J heat load calculation.