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 for residential applications.

2. How Does the Calculator Work?

The calculator uses the basic HVAC load formula:

Where:

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

Explanation: This simple calculation provides a rough estimate of the cooling capacity needed for a space.

3. Importance of HVAC Load Calculation

Details: Proper HVAC sizing is crucial for energy efficiency, comfort, and equipment longevity. Oversized units short cycle, while undersized units run continuously.

4. Using the Calculator

Tips: Enter the area in square feet. For more accurate results, consider additional factors like insulation, windows, and climate.

5. Frequently Asked Questions (FAQ)

Q1: Is 25 BTU/sq ft always accurate?
A: This is a general rule. Actual needs vary based on insulation, climate, windows, and other factors.

Q2: What if my space has high ceilings?
A: For ceilings over 8 feet, add about 10% more BTU per additional foot of ceiling height.

Q3: How does window area affect the calculation?
A: Large windows or poor insulation may require 30-35 BTU/sq ft instead of 25.

Q4: Should I use this for commercial spaces?
A: Commercial spaces often require more complex calculations considering occupancy and equipment heat loads.

Q5: What's the difference between BTU and tonnage?
A: 12,000 BTU/h equals 1 ton of cooling capacity. A 1,500 sq ft home would need about 37,500 BTU/h or ~3 tons.