1. What is Heat Pump Sizing?

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

2. How Does the Calculator Work?

The calculator uses the heat pump sizing formula:

Where:

• \( Area \) — Area to be heated/cooled in square feet
• \( Factor \) — BTU per square foot (typically 20-40 BTU/sq ft)
• \( Insulation\ Adjustment \) — Adjustment factor based on insulation quality (0.8-1.2)

Explanation: The calculation accounts for the size of the space and adjusts for how well insulated the space is.

3. Importance of Proper Sizing

Details: An undersized heat pump will struggle to maintain temperature, while an oversized one will short-cycle, reducing efficiency and lifespan.

4. Using the Calculator

Tips: Measure your space accurately. Choose the BTU factor based on your climate (higher for colder regions). Select insulation quality honestly for best results.

5. Frequently Asked Questions (FAQ)

Q1: What BTU factor should I use?
A: Use 20-25 for moderate climates, 30-35 for cold climates, and 35-40 for very cold climates.

Q2: How do I assess my insulation quality?
A: Poor insulation = noticeable drafts, cold walls; Average = some insulation but not optimal; Excellent = well-insulated, energy-efficient home.

Q3: Should I round up the BTU result?
A: Heat pumps come in standard sizes. Choose the next available size if your calculation falls between standard units.

Q4: Does ceiling height matter?
A: Yes, for ceilings over 8 feet, add 10% BTU capacity per extra foot of height.

Q5: What about windows and sun exposure?
A: South-facing windows may require 10% more capacity, while north-facing may need 10% less.