Heat Pump Capacity Calculation

Heat Pump Capacity Formula:

\[ \text{Capacity (BTU/hr)} = \text{Area (ft²)} \times \text{Factor (BTU/ft²)} \]

Capacity:

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1. What is Heat Pump Capacity?

Heat pump capacity refers to the heating or cooling output of a heat pump system, measured in British Thermal Units per hour (BTU/hr). Proper sizing is crucial for efficiency and comfort.

2. How Does the Calculator Work?

The calculator uses the basic heat pump capacity formula:

\[ \text{Capacity} = \text{Area} \times \text{Factor} \]

Where:

\( \text{Area} \) — Area to be conditioned (square feet)
\( \text{Factor} \) — BTU requirement per square foot (typically 30-60 BTU/ft²)

Explanation: The factor varies based on climate, insulation quality, and other factors. Warmer climates use lower factors (30-40), while colder climates use higher factors (40-60).

3. Importance of Proper Sizing

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

4. Using the Calculator

Tips: Measure your space accurately. Consider higher factors for poor insulation, large windows, or cold climates. For precise sizing, consult an HVAC professional.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical factor for my region?
A: Mild climates: 30-35 BTU/ft²; Moderate: 35-40; Cold: 40-50; Very cold: 50-60 BTU/ft².

Q2: How does ceiling height affect capacity?
A: For ceilings over 8 feet, increase capacity by 10% per additional foot.

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

Q4: What about heat pump efficiency ratings?
A: This calculation gives raw capacity. Consider HSPF (heating) and SEER (cooling) ratings for efficiency.

Q5: Does this account for zoning?
A: No. For zoned systems, calculate each zone separately and sum the capacities.