1. What is an AC Tonnage Calculator?

Definition: This calculator determines the cooling capacity of an air conditioning system in tons based on its BTU rating.

Purpose: It helps HVAC professionals and homeowners properly size air conditioning units for optimal performance and efficiency.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — AC tonnage (tons of cooling)
• \( BTU \) — British Thermal Units per hour (cooling capacity)

Explanation: One ton of cooling equals 12,000 BTU/hour. Dividing the total BTU by 12,000 converts the capacity to tons.

3. Importance of Proper AC Tonnage

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

4. Using the Calculator

Tips: Enter the cooling capacity in BTU/hr (found on the AC unit's specification plate). 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/24h = 12,000 BTU/h).

Q2: What's a typical tonnage for residential AC?
A: Most homes need 1-5 tons (12,000-60,000 BTU), depending on square footage, insulation, and climate.

Q3: How do I find my AC's BTU rating?
A: Check the model number (often contains BTU info) or the manufacturer's specification plate on the unit.

Q4: Can I use this for heat pumps?
A: Yes, the calculation works the same for heat pumps in cooling mode.

Q5: What if my calculation gives a decimal value?
A: AC units come in standard sizes (1.5, 2, 2.5, 3 tons etc.). Round to the nearest standard size when replacing equipment.