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

Definition: This calculator estimates the required capacity of an air source heat pump for UK homes based on floor area, heating requirements, and climate factors.

Purpose: It helps homeowners and installers determine the appropriate size heat pump needed for efficient heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Required heat pump capacity (BTU/h)
• \( A \) — Floor area (square feet)
• \( \text{BTU/ft}^2 \) — Heating requirement per square foot
• \( F \) — Climate adjustment factor

Explanation: The floor area is multiplied by the heating requirement and adjusted for local climate conditions.

3. Importance of Correct Sizing

Details: Proper sizing ensures energy efficiency, reduces running costs, and extends equipment lifespan. Oversized units short-cycle, while undersized units struggle to maintain temperature.

4. Using the Calculator

Tips: Enter the floor area in square feet, BTU/ft² requirement (default 20 for UK homes), and climate factor (default 1.2 for most of UK). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical BTU/ft² for UK homes?
A: Most UK homes require 15-25 BTU/ft². 20 BTU/ft² is a good average for moderately insulated homes.

Q2: How does the climate factor work?
A: Use 1.0 for mild coastal areas, 1.2 for most of UK, and 1.4 for colder northern regions or exposed locations.

Q3: Should I convert square meters to square feet?
A: Yes, multiply square meters by 10.764 to get square feet before using this calculator.

Q4: Does this account for insulation quality?
A: Adjust the BTU/ft² value - use 15 for well-insulated homes, 25 for poorly insulated ones.

Q5: How do I convert BTU/h to kW?
A: Divide BTU/h by 3412 to get kW. Most UK heat pumps are rated in kW.