1. What is Heat Pump Capacity?

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

2. How Does the Calculator Work?

The calculator uses the basic heat pump capacity formula:

Where:

• \( Area \) — The square footage of the space to be heated/cooled
• \( Factor \) — BTU requirement per square foot (typically 30-60 BTU/ft²)

Explanation: The factor varies based on climate, insulation quality, and other environmental factors. Warmer climates typically use 30-40 BTU/ft² while colder climates may need 40-60 BTU/ft².

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 run constantly without reaching desired temperatures.

4. Using the Calculator

Tips: Measure your space accurately in square feet. Choose an appropriate factor based on your climate zone and insulation quality. For precise sizing, consult with an HVAC professional.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between BTU and tonnage?
A: 12,000 BTU/hr equals 1 ton of cooling capacity. Most residential heat pumps range from 1.5 to 5 tons.

Q2: How does ceiling height affect capacity?
A: Rooms with ceilings higher than 8 feet may require additional capacity (about 10% more per extra foot).

Q3: What other factors should be considered?
A: Window quality, insulation, sun exposure, and local climate all affect the actual capacity needed.

Q4: Is this calculation suitable for both heating and cooling?
A: Yes, though heating capacity may need adjustment for very cold climates (below freezing temperatures).

Q5: Should I round up the calculated capacity?
A: Heat pumps come in standard sizes, so professionals typically round to the nearest available unit size.