1. What is HVAC Tonnage Calculation?

The HVAC tonnage calculation determines the cooling capacity needed for a space. One ton of cooling equals 12,000 BTU per hour. Proper sizing is crucial for efficiency and comfort.

2. How Does the Calculator Work?

The calculator uses the standard HVAC sizing formula:

Where:

• Square Feet — Area to be cooled
• BTU per Sq Ft — Cooling load factor (typically 20-30 BTU/sq ft)
• 12,000 — Conversion factor (1 ton = 12,000 BTU/hour)

Explanation: The calculation converts the total BTU requirement into tons of cooling capacity.

3. Importance of Proper Sizing

Details: Correct HVAC sizing prevents energy waste, ensures proper dehumidification, and extends equipment life. Oversized units short-cycle, while undersized units can't maintain temperature.

4. Using the Calculator

Tips: Enter square footage and BTU per square foot (25 is typical for average homes). The calculator will determine the required tonnage.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical BTU per square foot?
A: Typically 20-30 BTU/sq ft, with 25 as average. Hot climates may need 30+, while cooler areas may use 20.

Q2: How many square feet does 1 ton cool?
A: At 25 BTU/sq ft, 1 ton cools about 480 sq ft (12,000 ÷ 25 = 480).

Q3: What factors affect BTU requirements?
A: Climate, insulation, windows, ceiling height, occupancy, and heat-producing appliances all affect cooling needs.

Q4: Should I round up the tonnage?
A: HVAC systems come in standard sizes (1.5, 2, 2.5, 3, etc. tons). Round to nearest standard size, but consult an HVAC professional.

Q5: Is this calculation sufficient for system selection?
A: This provides an estimate. A Manual J calculation by an HVAC professional considers all factors for precise sizing.