Aircon Size Calculator Australia

Aircon Size Formula:

\[ P_{kW} = \frac{A_{room} \times 44.6}{3412 \times EER} \]

Required Aircon Size (kW):

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1. What is an Aircon Size Calculator for Australia?

Definition: This calculator estimates the required air conditioning capacity (in kW) based on room area and the unit's Energy Efficiency Ratio (EER).

Purpose: It helps homeowners and professionals select the appropriately sized air conditioner for Australian conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ P_{kW} = \frac{A_{room} \times 44.6}{3412 \times EER} \]

Where:

\( P_{kW} \) — Required aircon power (kilowatts)
\( A_{room} \) — Room area (square meters)
\( EER \) — Energy Efficiency Ratio (dimensionless)

Explanation: The formula converts British Thermal Units (BTU) to kW and accounts for Australian climate conditions and energy efficiency.

3. Importance of Proper Aircon Sizing

Details: Correct sizing ensures energy efficiency, proper cooling, and prevents short-cycling or excessive wear on the unit.

4. Using the Calculator

Tips: Enter the room area in square meters and the EER rating (default 3.5 for standard units). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is EER?
A: Energy Efficiency Ratio measures how efficiently an aircon unit uses electricity (higher is better).

Q2: Why 44.6 in the formula?
A: This converts the Australian standard of 125 BTU per m² to the calculation (125 × 0.293 = 44.6).

Q3: What's a typical EER rating?
A: Standard units range from 3.0-3.5, while high-efficiency units can reach 4.0-5.0.

Q4: Should I round up the result?
A: Yes, aircon units come in standard sizes (2.5kW, 3.5kW, 5kW, etc.) - round up to the nearest available size.

Q5: Does this account for insulation?
A: No, for poor insulation add 10-20% to the calculated capacity, or subtract 10% for excellent insulation.