1. What is BTU in Heat Pumps?

BTU (British Thermal Unit) is a measure of heating/cooling capacity. For heat pumps, it indicates how much heat energy the unit can move per hour. Proper sizing is crucial for efficiency and comfort.

2. How Does the Calculator Work?

The calculator uses the basic sizing formula:

Where:

• \( Area \) — Square footage of the space (sq ft)
• \( Factor \) — BTU per square foot (typically 20-40 BTU/sq ft)

Explanation: The factor varies based on climate, insulation, ceiling height, and other factors. Warmer climates and poor insulation require higher factors.

3. Importance of Proper Sizing

Details: An oversized unit will short-cycle (turn on/off frequently), reducing efficiency and lifespan. An undersized unit will run constantly, struggling to maintain temperature.

4. Using the Calculator

Tips: Measure your space accurately. Consider climate, insulation, window area, and ceiling height when selecting the BTU factor.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical BTU factor for my area?
A: Mild climates: 20-25, Moderate: 25-30, Hot: 30-35, Very hot: 35-40 BTU/sq ft.

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

Q3: What about room insulation?
A: Poor insulation may require 10-20% more BTU capacity.

Q4: Should I size up for extreme temperatures?
A: In areas with very cold winters or hot summers, consider 10-20% additional capacity.

Q5: What are standard heat pump sizes?
A: Common residential sizes are 18k, 24k, 30k, 36k, 42k, 48k, and 60k BTU/hr.