1. What is an AC Calculation for Room Size?

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

Purpose: It helps homeowners and HVAC professionals properly size air conditioning units for optimal performance 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 (BTU/hr per m²)
• 3412 — Conversion factor (BTU/hr per kW)

Explanation: The formula converts room size to cooling capacity needs (BTU/hr) then calculates the electrical power required based on the AC unit's efficiency.

3. Importance of Proper AC Sizing

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

4. Using the Calculator

Tips: Enter the room area in square meters and the AC unit's EER rating (default 3.5). Both values must be > 0.

5. Frequently Asked Questions (FAQ)

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

Q2: What's a typical EER rating?
A: Standard units range 8-12 EER, while high-efficiency units can reach 12+ EER. The default 3.5 accounts for conversion factors.

Q3: Does this account for room height?
A: The calculator assumes standard ceiling heights. For taller ceilings, multiply the result by (actual height/2.4m).

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

Q5: How do I convert kW to BTU/hr?
A: Multiply kW by 3412 to get BTU/hr. Our result already accounts for this conversion.