1. What is House Heat Load?

The house heat load represents the amount of heating required to maintain a comfortable temperature in a space, measured in British Thermal Units per hour (BTU/h). It's essential for proper HVAC system sizing.

2. How Does the Calculator Work?

The calculator uses the basic heat load formula:

Where:

• \( Area \) — Floor area in square feet
• \( 35 \) — Standard BTU per square foot factor for moderate climates

Explanation: This simplified calculation assumes standard insulation and climate conditions. Actual requirements may vary based on insulation, windows, and local climate.

3. Importance of Heat Load Calculation

Details: Proper heat load calculation ensures your heating system is correctly sized - neither too small (inadequate heating) nor too large (short cycling, inefficiency).

4. Using the Calculator

Tips: Enter the total heated area of your space in square feet. For more accurate results, consider professional Manual J calculations that account for insulation, windows, and local climate.

5. Frequently Asked Questions (FAQ)

Q1: Why 35 BTU per square foot?
A: This is a general rule of thumb for moderately insulated homes in temperate climates. Colder climates may require 40-45 BTU/sq ft.

Q2: What if my house has poor insulation?
A: Poorly insulated homes may require 50-60 BTU/sq ft or more. Consider energy efficiency upgrades.

Q3: Does ceiling height matter?
A: Yes, this simple calculator assumes standard 8-9 ft ceilings. Higher ceilings require more heating capacity.

Q4: Should I include unheated spaces?
A: No, only include areas that will be actively heated.

Q5: When should I get a professional calculation?
A: For new construction, major renovations, or if you have unusual architectural features, a Manual J calculation is recommended.