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/hour. Proper sizing is crucial for efficiency and comfort.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Square Feet — Area to be cooled
• BTU per Square Foot — Cooling load factor (typically 20-30 BTU/ft²)
• 12000 — Conversion factor (1 ton = 12,000 BTU/hour)

Explanation: The calculation estimates the required cooling capacity based on the size of the space and typical cooling requirements.

3. Importance of Proper HVAC Sizing

Details: Correct HVAC sizing ensures energy efficiency, proper humidity control, and system longevity. Oversized units short cycle, while undersized units run constantly.

4. Using the Calculator

Tips: Enter the square footage of your space and the appropriate BTU per square foot (25 is typical for average conditions). Adjust BTU value based on climate and insulation.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical BTU per square foot?
A: Average is 20-30 BTU/ft². Use higher values for hot climates/poor insulation, lower for cool climates/good insulation.

Q2: How many square feet does 1 ton cool?
A: Approximately 400-600 ft² depending on climate and insulation (using 20-30 BTU/ft² calculation).

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

Q4: Is this calculation sufficient for HVAC sizing?
A: This provides an estimate. Professional Manual J calculation considers more factors for precise sizing.

Q5: What about heat pumps?
A: Heat pump sizing uses similar calculations but must account for heating needs in winter as well.