1. What is Heat Pump Sizing?

Heat pump sizing refers to determining the appropriate capacity (in BTUs) needed to effectively heat or cool a given space. Proper sizing is crucial for efficiency, comfort, and system longevity.

2. How Does the Calculator Work?

The calculator uses the basic heat pump sizing formula:

Where:

• \( BTU \) — British Thermal Units (heat pump capacity)
• \( Area \) — Area to be conditioned (square feet)
• \( Factor \) — BTU per square foot factor (typically 20-40)

Explanation: The factor accounts for climate, insulation, and other variables that affect heating/cooling needs.

3. Importance of Proper Sizing

Details: Correct heat pump sizing ensures energy efficiency, proper dehumidification, even temperature distribution, and prevents short cycling which can reduce equipment lifespan.

4. Using the Calculator

Tips: Measure your space accurately. Choose a factor between 20-40 based on your climate (20 for mild, 30 for moderate, 40 for extreme climates) and insulation quality.

5. Frequently Asked Questions (FAQ)

Q1: What happens if my heat pump is oversized?
A: Oversized units short cycle (turn on/off frequently), reducing efficiency, increasing wear, and providing poor humidity control.

Q2: What's the difference between BTU and tonnage?
A: 12,000 BTU = 1 ton. Most residential heat pumps range from 1.5 to 5 tons.

Q3: Should I get a professional load calculation?
A: For best results, yes. This calculator provides a basic estimate but a Manual J calculation considers more factors.

Q4: How does climate affect the factor?
A: Colder climates need higher factors (30-40 BTU/sq ft) while warmer climates can use lower factors (20-30 BTU/sq ft).

Q5: What about heat pumps for cooling?
A: The same sizing principles apply since heat pumps provide both heating and cooling.