1. What is the HVAC Load Calculation?

The HVAC load calculation estimates the heating and cooling requirements for a space in British Thermal Units per hour (BTU/h). This Service Titan method provides a quick estimation based on area and adjustments for special conditions.

2. How Does the Calculator Work?

The calculator uses the basic HVAC load equation:

Where:

• \( Area \) — Floor area in square feet
• \( 30 \) — Base BTU per square foot (adjustable for climate)
• \( Adjustments \) — Additional BTU requirements for special conditions

Explanation: The equation provides a basic estimation of HVAC needs, with 30 BTU/sq ft as a common baseline that can be adjusted for climate and building characteristics.

3. Importance of HVAC Load Calculation

Details: Proper HVAC sizing is crucial for energy efficiency, comfort, and system longevity. Oversized units short-cycle, while undersized units can't maintain temperature.

4. Using the Calculator

Tips: Enter area in square feet and any additional BTU requirements (for high ceilings, windows, appliances, etc.). The base calculation assumes standard 8-foot ceilings and moderate insulation.

5. Frequently Asked Questions (FAQ)

Q1: When should I use adjustments?
A: Use adjustments for large windows, high ceilings, poor insulation, or special equipment that generates heat.

Q2: Is 30 BTU/sq ft appropriate for all climates?
A: No, this is a moderate baseline. Hot climates may need 35-40 BTU/sq ft, while mild climates may need only 20-25.

Q3: What's included in the base calculation?
A: The base 30 BTU/sq ft accounts for standard occupancy, lighting, and equipment loads in a moderately insulated space.

Q4: How accurate is this simple calculation?
A: It provides a rough estimate. For precise sizing, use Manual J calculations that consider more factors.

Q5: Should I round up the result?
A: HVAC units come in standard sizes. Round up to the nearest available unit size after adding a 10-20% safety factor.