1. What is an Air Source Heat Pump Calculator?

Definition: This calculator estimates the heat output (in BTU/h) required for an air source heat pump based on area, BTU per square foot, and adjustment factors.

Purpose: It helps HVAC professionals and homeowners determine the appropriate heat pump size for a given space.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heat output (BTU/h)
• \( A \) — Area to be heated (ft²)
• \( \text{BTU/ft}^2 \) — BTU requirement per square foot
• \( F \) — Adjustment factor for climate and insulation

Explanation: The area is multiplied by the BTU requirement per square foot, then adjusted for specific conditions.

3. Importance of Proper Sizing

Details: Correct heat pump sizing ensures energy efficiency, proper heating/cooling, and system longevity.

4. Using the Calculator

Tips: Enter the area in square feet, BTU per square foot (default 20), and adjustment factor (default 1.0). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU/ft² value?
A: For moderate climates, 20 BTU/ft² is common. Colder climates may need 30-40 BTU/ft².

Q2: When should I adjust the factor?
A: Increase for poor insulation (1.2-1.5) or decrease for excellent insulation (0.7-0.9).

Q3: Does this account for cooling needs?
A: This calculates heating needs. For cooling, use 15-20 BTU/ft² as a starting point.

Q4: How do I measure the area?
A: Calculate length × width for each room, then sum all areas.

Q5: Should I add extra capacity?
A: It's recommended to add 10-20% for unusually high ceilings or many windows.