1. What is HVAC Load Calculation?

The HVAC load calculation estimates the heating/cooling capacity needed for a space. This quick calculation uses a standard rule of thumb of 25 BTU per square foot.

2. How Does the Calculator Work?

The calculator uses the simple equation:

Where:

• \( Sq Ft \) — Area in square feet
• \( 25\ BTU/ft² \) — Standard cooling load factor

Explanation: This provides a quick estimate for residential cooling needs in moderate climates.

3. Importance of Load Calculation

Details: Proper sizing prevents energy waste and ensures comfort. Oversized units short-cycle, while undersized units can't maintain temperature.

4. Using the Calculator

Tips: Enter the total square footage of the conditioned space. For precise calculations, consult a Manual J calculation.

5. Frequently Asked Questions (FAQ)

Q1: Is 25 BTU/ft² accurate for all homes?
A: This is a general estimate. Actual needs vary by climate, insulation, windows, and other factors.

Q2: What if my home is well insulated?
A: Well-insulated homes may need 20-22 BTU/ft², while poorly insulated may need 30+ BTU/ft².

Q3: Does this work for heating too?
A: Heating loads typically require less capacity (15-20 BTU/ft²) in moderate climates.

Q4: When should I use Manual J instead?
A: For new construction, major renovations, or when precise sizing is critical.

Q5: How does ceiling height affect this?
A: Standard calculation assumes 8ft ceilings. Higher ceilings increase volume and may need adjustment.