Air Source Heat Pump Sizing Calculator

Heat Pump Sizing Formula:

\[ Q = A \times \text{BTU/ft}^2 \times F \]

Heat Pump Capacity (Q):

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

Definition: This calculator estimates the required capacity of an air source heat pump based on area, BTU requirements, and climate factors.

Purpose: It helps homeowners and HVAC professionals properly size heat pumps for efficient heating and cooling.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = A \times \text{BTU/ft}^2 \times F \]

Where:

\( Q \) — Heat pump capacity (BTU/h)
\( A \) — Area to be conditioned (square feet)
\( \text{BTU/ft}^2 \) — Heating/cooling requirement per square foot
\( F \) — Climate and insulation factor

Explanation: The area is multiplied by BTU requirements per square foot, then adjusted for climate and insulation factors.

3. Importance of Proper Heat Pump Sizing

Details: Correct sizing ensures energy efficiency, proper temperature control, and prevents short cycling or inadequate heating/cooling.

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: Typically 20 BTU/ft² for moderate climates, 25-30 for cold climates, and 15-18 for warm climates.

Q2: How do I determine the factor (F)?
A: Use 0.8-1.0 for well-insulated homes, 1.1-1.3 for average insulation, and 1.4+ for poor insulation or extreme climates.

Q3: Should I size for heating or cooling?
A: In most cases, size for heating needs as they're typically greater than cooling requirements.

Q4: Does this include duct losses?
A: No, add 10-20% if ducts are in unconditioned spaces like attics or crawlspaces.

Q5: How do I convert BTU/h to tons?
A: Divide BTU/h by 12,000 (1 ton = 12,000 BTU/h).