1. What is an Air Source Heat Pump Size Calculator?

Definition: This calculator estimates the required capacity of an air source heat pump based on area, heating/cooling needs, and adjustment factors.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Required heat pump capacity (BTU/h)
• \( A \) — Area to be conditioned (square feet)
• \( \text{BTU/ft}^2 \) — Heating/cooling load per square foot
• \( F \) — Adjustment factor for climate and insulation

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

3. Importance of Proper Heat Pump Sizing

Details: Correct sizing ensures energy efficiency, proper comfort, and system longevity. Oversized units short-cycle, while undersized units can't maintain temperature.

4. Using the Calculator

Tips: Enter the area in square feet, BTU/ft² (default 20 for moderate climates), and factor (default 1.0 for average insulation). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU/ft² value?
A: Moderate climates use 20-30 BTU/ft², cold climates 30-40, and warm climates 15-20.

Q2: How do I determine the factor (F)?
A: Use 0.8-0.9 for well-insulated homes, 1.0 for average, 1.1-1.3 for poor insulation or extreme climates.

Q3: Does this account for both heating and cooling?
A: Yes, but you may need separate calculations for each if requirements differ significantly.

Q4: Should I round up the result?
A: Heat pumps come in standard sizes (12,000 BTU, 18,000 BTU, etc.). Round up to the nearest available size.

Q5: What about room height and windows?
A: These are accounted for in your BTU/ft² estimate. Higher ceilings or large windows may require higher BTU/ft² values.