1. What is a House Heat Load Calculator?

Definition: This calculator estimates the heating requirement for a house based on its area, heat factor, and window adjustments.

Purpose: It helps homeowners and HVAC professionals determine the appropriate heating system capacity needed for a space.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HL \) — Heat load (BTU/h)
• \( A \) — House area (square feet)
• \( F \) — Heat factor (BTU/h per square foot)
• \( W \) — Windows adjustment (additional BTU/h)

Explanation: The house area is multiplied by a factor representing typical heat loss per square foot, then adjusted for additional heat loss through windows.

3. Importance of Heat Load Calculation

Details: Proper heat load estimation ensures comfortable indoor temperatures, energy efficiency, and correctly sized HVAC equipment.

4. Using the Calculator

Tips: Enter the house area in square feet, heat factor (default 25 BTU/h sq ft), and any additional window adjustment. Area and factor must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical heat factor value?
A: For moderately insulated homes, 25 BTU/h per sq ft is common. Use 30-35 for poorly insulated, 20 for well-insulated homes.

Q2: How do I determine the windows adjustment?
A: Add 1000 BTU/h per large window or sliding glass door, 500 BTU/h for standard windows.

Q3: Does this include climate considerations?
A: The factor should account for your climate zone. Colder climates may need higher factors.

Q4: What about ceiling height?
A: Standard calculation assumes 8 ft ceilings. For higher ceilings, increase the factor proportionally.

Q5: Should I add any safety margin?
A: It's recommended to add 10-20% to the calculated value for extreme weather conditions.