1. What is an Air Conditioner Size Calculator?

Definition: This calculator estimates the required air conditioner size (in kW) based on room area and the unit's energy efficiency ratio (EER).

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Air conditioner size (kilowatts)
• \( A_{room} \) — Room area (square meters)
• \( EER \) — Energy Efficiency Ratio (dimensionless)
• 44.6 — Conversion factor (BTU/hr per m²)
• 3412 — Conversion factor (BTU/hr to kW)

Explanation: The formula converts room area to cooling requirements and adjusts for the unit's efficiency.

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 (typically 3.0-5.0, default 3.5). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is EER?
A: Energy Efficiency Ratio measures cooling output (BTU/hr) divided by power input (watts). Higher EER means more efficiency.

Q2: What's a typical EER rating?
A: Standard units range 8-12 EER (3.0-4.5 in this formula's terms), while high-efficiency units can reach 14+ (5.0+).

Q3: Should I round up the calculated size?
A: Generally yes, to the nearest standard unit size (0.5kW increments), but avoid significantly oversizing.

Q4: Does this account for room height?
A: This basic calculation assumes standard 2.4-2.7m ceilings. For higher ceilings, increase the area proportionally.

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