1. What is an Air Conditioner Sizing Calculator?

Definition: This calculator estimates the required air conditioner power 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)

Explanation: The formula converts room area to cooling capacity (BTU/hr) and then to kilowatts, adjusted by the unit's efficiency.

3. Importance of Proper AC Sizing

Details: Correct sizing ensures efficient operation, prevents short cycling, maintains comfort, and reduces energy costs.

4. Using the Calculator

Tips: Enter the room area in square meters and the EER (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/hr) divided by power input (watts). Higher EER means better efficiency.

Q2: What's a typical EER value?
A: Standard units range 8-12 EER (converted to this formula's scale as 2.5-3.5), while high-efficiency units can reach 4+.

Q3: How does room height affect the calculation?
A: This calculator assumes standard ceiling height. For taller rooms, multiply area by (height/2.4m) before entering.

Q4: What about windows, insulation, or sunlight?
A: For many windows or poor insulation, add 10-20% to the calculated power. For north-facing or well-insulated rooms, subtract 10%.

Q5: How do I convert the result to BTU/hr?
A: Multiply kW result by 3412 to get BTU/hr, the more common AC capacity measurement.