1. What is HVAC Load Calculation?

HVAC load calculation determines the heating and cooling capacity needed for a space. The basic rule of thumb is 25 BTU per square foot, though professional calculations consider many additional factors.

2. How Does the Calculator Work?

The calculator uses the basic formula:

Where:

• \( BTU/h \) — British Thermal Units per hour (cooling capacity)
• \( Area \) — Square footage of the space
• 25 — Standard BTU per square foot multiplier

Note: This is a simplified calculation. Professional HVAC providers use Manual J calculations that consider insulation, windows, climate, and other factors.

3. Importance of Proper HVAC Sizing

Details: Proper HVAC sizing is crucial for energy efficiency, comfort, and system longevity. Oversized units short-cycle, while undersized units can't maintain temperature.

4. Using the Calculator

Tips: Enter the area in square feet. For multiple rooms, calculate each separately or sum their areas. This provides a rough estimate for residential spaces.

5. Frequently Asked Questions (FAQ)

Q1: Is 25 BTU/sq.ft always accurate?
A: No, it's a rule of thumb. Hot climates may need 30-35 BTU/sq.ft, while well-insulated homes may need only 20.

Q2: What factors affect HVAC load?
A: Insulation, window quality, ceiling height, local climate, number of occupants, and appliance heat.

Q3: Should I use this for commercial spaces?
A: No, commercial HVAC requires professional load calculations due to complex factors.

Q4: How do I find HVAC providers?
A: Look for licensed contractors who perform Manual J load calculations for accurate sizing.

Q5: What's the difference between BTU and tonnage?
A: 1 ton of cooling = 12,000 BTU/h. A 1,500 sq.ft home would need about 37,500 BTU/h or ~3.1 tons.