1. What is an Air Conditioner kW Calculator?

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 determine the appropriate AC unit size for a given space.

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, then factors in the unit's efficiency.

3. Importance of Proper AC Sizing

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

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 how efficiently an AC unit operates (higher = more efficient). Standard units range 3-5, premium units 8-12.

Q2: How do I find my AC's EER?
A: Check the unit's specification sheet or energy guide label. It's often listed in the product documentation.

Q3: Does this account for room height?
A: This calculator assumes standard ceiling heights (2.4-2.7m). For higher ceilings, increase the room area proportionally.

Q4: What about room insulation or sunlight?
A: For poor insulation or sun-facing rooms, consider adding 10-20% to the calculated power.

Q5: Can I use this for whole-house AC?
A: Yes, use the total area of all rooms to be cooled. For zoned systems, calculate each zone separately.