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
• \( BTU\,per\,Square\,Foot \) — Typically 20-30 BTU/sq ft for residential
• \( 12000 \) — Conversion factor (BTU to tons)

Explanation: The calculation estimates the cooling capacity needed based on the size of the space and typical cooling requirements per square foot.

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 square footage of the space and BTU per square foot (25 is typical for most homes). The calculator will determine the required tons of cooling capacity.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical BTU per square foot?
A: Most homes need 20-30 BTU/sq ft. Warmer climates or sunnier exposures may need more (up to 35 BTU/sq ft).

Q2: How many square feet does 1 ton cool?
A: Approximately 400-600 sq ft per ton, depending on climate and insulation (using 25 BTU/sq ft = 480 sq ft/ton).

Q3: What factors affect BTU requirements?
A: Climate, insulation, window area, ceiling height, occupancy, and heat-producing appliances all impact 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 performed by a professional considers all factors for precise sizing.