1. What is an Air Conditioner Room Size Calculator?

Definition: This calculator estimates the appropriate room size (in square meters) that can be effectively cooled by an air conditioner based on its power and efficiency.

Purpose: It helps homeowners and HVAC professionals determine if an AC unit is properly sized for a given space.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( A_{room} \) — Room area (square meters)
• \( P_{kW} \) — Air conditioner power (kilowatts)
• \( EER \) — Energy Efficiency Ratio (dimensionless)
• 3412 — Conversion factor (BTU per kWh)
• 44.6 — Conversion factor (BTU per hour per square meter)

Explanation: The formula converts AC power to cooling capacity (BTU/h) using EER, then determines how much area that capacity can effectively cool.

3. Importance of Proper AC Sizing

Details: Correct AC sizing ensures energy efficiency, proper humidity control, and equipment longevity. Oversized units short-cycle, while undersized units run continuously.

4. Using the Calculator

Tips: Enter the AC's rated power in kW and its EER (typically 3.0-4.5 for residential units). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is EER?
A: Energy Efficiency Ratio is the cooling capacity (BTU/h) divided by power input (watts) at standard test conditions.

Q2: What's a typical EER value?
A: Standard units range 8-12 EER (2.3-3.5 in kW terms), while high-efficiency units can reach 14+ EER (4.1+).

Q3: How does room insulation affect this calculation?
A: Poor insulation may require a 10-20% larger unit, while excellent insulation might allow a smaller unit.

Q4: What about room height?
A: This assumes standard 2.4-2.7m ceilings. For higher ceilings, increase capacity proportionally.

Q5: Does this account for windows and sunlight?
A: No, for sun-facing rooms or many windows, consider increasing capacity by 10-20%.