1. What is an Air Conditioner Size Calculator?

Definition: This calculator estimates the required air conditioner size in kilowatts (kW) based on room area and Energy Efficiency Ratio (EER).

Purpose: It helps homeowners and HVAC professionals determine the appropriate AC unit size for optimal cooling and energy efficiency.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Required AC power (kilowatts)
• \( A_{room} \) — Room area (square meters)
• \( EER \) — Energy Efficiency Ratio (dimensionless)
• 44.6 — Conversion factor (W/m² per °C temperature difference)
• 3412 — Conversion from BTU/h to kW

Explanation: The formula calculates the cooling capacity needed based on room size, adjusted by the unit's efficiency rating.

3. Importance of Proper AC Sizing

Details: Correct sizing ensures energy efficiency, proper humidity control, and prevents short-cycling or insufficient cooling.

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 cooling output (BTU/h) divided by power input (W). Higher EER means better efficiency.

Q2: What's a typical EER rating?
A: Standard units range 3.0-3.5, while high-efficiency models can reach 4.0-5.0.

Q3: Should I round up the calculated size?
A: Yes, round up to the nearest standard unit size (0.5 kW increments typically).

Q4: Does this account for room height?
A: The calculation assumes standard ceiling heights (2.4-2.7m). For higher ceilings, increase the area proportionally.

Q5: What other factors affect AC sizing?
A: Consider insulation, windows, sunlight exposure, and heat-generating appliances which may require adjustments.