1. What is an AC Tonnage Calculator?

Definition: This calculator converts air conditioning cooling capacity from BTU/hr to tons of refrigeration.

Purpose: It helps HVAC professionals and homeowners determine the appropriate size of an air conditioning unit for a given space.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: One ton of refrigeration equals 12,000 BTU per hour, which is the amount of heat needed to melt one ton of ice in 24 hours.

3. Importance of AC Tonnage Calculation

Details: Proper AC sizing ensures energy efficiency, optimal performance, and prevents short-cycling or insufficient cooling.

4. Using the Calculator

Tips: Enter the cooling capacity in BTU/hr (typically between 18,000-60,000 BTU/hr for residential systems). The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is 12,000 BTU equal to 1 ton?
A: This comes from the historical definition of a ton of refrigeration - the cooling effect of melting one ton of ice in 24 hours.

Q2: How do I find the BTU requirement for my space?
A: Use our BTU Calculator or consult an HVAC professional who can perform a Manual J load calculation.

Q3: What's a typical tonnage for a house?
A: Most homes need 1-5 tons (12,000-60,000 BTU), with 1 ton typically cooling 400-600 sq ft depending on climate and insulation.

Q4: Can I round up the calculated tonnage?
A: AC units come in standard sizes (1, 1.5, 2, 2.5, 3, 3.5, 4, 5 tons). Choose the next available size if your calculation falls between standard sizes.

Q5: What happens if my AC is oversized?
A: Oversized units cool too quickly, leading to poor humidity control, frequent cycling, and reduced efficiency.