1. What is an AC Unit Tonnage Calculator?

Definition: This calculator converts an air conditioner's cooling capacity from BTU/hr to tons of refrigeration.

Purpose: It helps HVAC professionals and homeowners determine the appropriate AC unit size for their needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — Tonnage of AC unit (tons)
• \( BTU \) — Cooling capacity (BTU per hour)

Explanation: One ton of cooling capacity equals 12,000 BTU per hour. The formula converts BTU/hr to tons by dividing by 12,000.

3. Importance of Proper AC Sizing

Details: Correct tonnage calculation 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 the AC unit's specification plate). The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is AC capacity measured in tons?
A: It originates from the amount of heat needed to melt one ton of ice in 24 hours (12,000 BTU/hr).

Q2: What's the typical tonnage for a home?
A: Most homes need 1-5 tons (12,000-60,000 BTU/hr), with 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 specification plate on the outdoor unit.

Q4: What if my calculation results in a decimal?
A: AC units come in standard sizes (1.5, 2, 2.5, 3, 3.5, 4, 5 tons). Round to the nearest standard size.

Q5: Does this account for climate or insulation?
A: No, this is a basic conversion. For proper sizing, consult an HVAC professional who considers all factors.