1. What is HVAC Load Calculation?

HVAC load calculation determines the heating and cooling capacity needed for a space, measured in BTU/h (British Thermal Units per hour). Proper calculation ensures efficient system sizing and energy use.

2. How Does the Calculator Work?

The calculator uses the residential load calculation formula:

Where heating factors include:

• Climate zone adjustments
• Insulation quality factors
• Window count adjustments

Explanation: The base formula provides cooling needs, while additional factors account for heating requirements based on environmental conditions.

3. Importance of Proper Load Calculation

Details: Accurate load calculation prevents oversizing (which leads to short cycling and inefficiency) and undersizing (which causes inadequate temperature control).

4. Using the Calculator

Tips: Enter accurate square footage, select appropriate climate zone and insulation quality, and count all windows. More precise calculations may require professional Manual J calculations.

5. Frequently Asked Questions (FAQ)

Q1: Why 25 BTU per square foot for cooling?
A: This is a rule-of-thumb for residential cooling in moderate climates. Actual needs vary based on many factors.

Q2: What's the difference between cooling and heating loads?
A: Cooling loads primarily deal with heat gain, while heating loads address heat loss, which depends more on insulation and climate.

Q3: When should I use a professional load calculation?
A: For new construction, major renovations, or if you have unusual home features (high ceilings, sunrooms, etc.).

Q4: How does insulation affect the calculation?
A: Better insulation reduces heating needs significantly but has less impact on cooling requirements.

Q5: What about other factors like ceiling height?
A: This simplified calculator assumes standard 8-foot ceilings. Higher ceilings require additional capacity.