1. What is Heat Pump Sizing?

Heat pump sizing refers to determining the appropriate capacity (in BTU) of a heat pump needed to effectively heat or cool a space. Proper sizing is crucial for energy efficiency and comfort in New Zealand homes.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( Area \) — Floor area in square feet
• \( Factor \) — BTU per square foot (typically 25-30 for NZ homes)
• \( Insulation\ Adjustment \) — Multiplier based on insulation quality (0.8-1.2)

Explanation: The calculation accounts for both the size of the space and the insulation quality, which significantly affects heating/cooling requirements in New Zealand's climate.

3. Importance of Correct Sizing

Details: An undersized heat pump will struggle to maintain temperature, while an oversized unit will short-cycle, reducing efficiency and lifespan. Proper sizing ensures optimal performance and energy savings.

4. Using the Calculator

Tips: Measure your room's floor area accurately. Choose the BTU factor based on your climate zone (typically 25-30 for most NZ locations). Select insulation quality that best matches your home.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical BTU factor for NZ homes?
A: Most New Zealand homes use 25-30 BTU per square foot, depending on regional climate and room characteristics.

Q2: How do I assess my home's insulation?
A: Consider when your home was built (post-2000 generally better), presence of ceiling/underfloor insulation, and double glazing.

Q3: Should I round up the BTU result?
A: Choose the nearest available heat pump size, slightly larger if between sizes, but avoid significant oversizing.

Q4: Does room height affect sizing?
A: Standard calculations assume 2.4m ceilings. For higher ceilings, consider increasing the BTU factor.

Q5: What about open-plan areas?
A: For open-plan living areas, calculate the total space but consider separate units for bedrooms if doors are usually closed.