1. What is an AC Tonnage Calculator?

Definition: This calculator estimates the required air conditioning capacity in tons based on the cooling requirements in BTU/hr.

Purpose: It helps homeowners and HVAC professionals determine the appropriate AC unit size for a room or building.

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 AC tonnage units.

3. Importance of Proper AC Sizing

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

4. Using the Calculator

Tips: Enter the total cooling capacity in BTU/hr (typically 20-30 BTU per square foot). The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine the BTU requirement for my room?
A: Multiply room square footage by 20 (cool climate), 25 (moderate), or 30 (hot climate) BTU per sq ft.

Q2: What's the relationship between tons and BTU?
A: 1 ton of cooling = 12,000 BTU/hr. This originates from the heat needed to melt 1 ton of ice in 24 hours.

Q3: What if my calculation results in a decimal tonnage?
A: Round up to the nearest standard unit size (1.5, 2, 2.5, 3, 3.5, 4, or 5 tons).

Q4: Should I consider other factors besides square footage?
A: Yes, account for ceiling height, insulation, windows, sunlight exposure, and heat-producing appliances.

Q5: What happens if I choose the wrong tonnage?
A: Undersized units run constantly, while oversized units short cycle, both reducing efficiency and comfort.