1. What is an Air Conditioner Sizing Calculator?

Definition: This calculator estimates the required power for an air conditioner based on room area 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 (W/m² to BTU/h)
• 3412 — Conversion factor (BTU/h to kW)

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

3. Importance of Proper AC Sizing

Details: Correct sizing ensures energy efficiency, proper dehumidification, 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 10). 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 (W) at standard test conditions.

Q2: What's a typical EER rating?
A: Standard units range 8-12, while high-efficiency models can reach 14+. Higher EER means more efficient.

Q3: Does this account for room insulation?
A: The 44.6 W/m² factor assumes average conditions. Increase by 10-20% for poor insulation or sunny rooms.

Q4: How does this relate to BTU ratings?
A: Multiply kW result by 3412 to get BTU/h. Example: 3.5 kW ≈ 12,000 BTU (1 ton of cooling).

Q5: What about multiple rooms?
A: Calculate each room separately or sum their areas for open floor plans.