1. What is an AC Tonnage Calculator?

Definition: This calculator determines the air conditioning tonnage required for a residential space based on cooling capacity in BTU/hr.

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

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 capacity equals 12,000 BTU per hour. The formula converts BTU to standard AC tonnage units.

3. Importance of Proper AC Sizing

Details: Correct tonnage calculation ensures energy efficiency, proper cooling, and prevents system strain from undersizing or short cycling from oversizing.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

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

Q2: How do I find my cooling capacity needs?
A: A basic estimate is 20 BTU per sq ft, but consider factors like insulation, climate, and sun exposure for accurate sizing.

Q3: What's a typical tonnage for a house?
A: Most homes need 1-5 tons (12,000-60,000 BTU), with average homes requiring about 1 ton per 400-600 sq ft.

Q4: Should I round up the calculated tonnage?
A: HVAC systems come in standard sizes (1, 1.5, 2, 2.5, etc. tons). Round to the nearest standard size, considering your climate.

Q5: Does this account for humidity control?
A: No, in humid climates you might need slightly less tonnage but longer run times for proper dehumidification.