Air Conditioning System Size Calculator

AC System Size Formula:

\[ P_{kW} = \frac{A_{room} \times 44.6}{3412 \times EER} \]

AC System Size (kW):

Definition: This calculator estimates the required size (in kW) of an air conditioning system based on room area and energy efficiency ratio.

Purpose: It helps homeowners and HVAC professionals determine the appropriate AC unit size for optimal cooling efficiency.

The calculator uses the formula:

\[ P_{kW} = \frac{A_{room} \times 44.6}{3412 \times EER} \]

Where:

Explanation: The formula converts BTU requirements to kW while accounting for the system's energy efficiency.

Details: Correct sizing ensures energy efficiency, proper cooling, and prevents system overwork or short cycling.

Tips: Enter the room area in square meters and the EER (default 3.5). All values must be > 0.

Q1: What is EER?
A: Energy Efficiency Ratio measures how efficiently a cooling system operates (higher values = more efficient).

Q2: What's a typical EER value?
A: Standard AC units range from 8-12 EER, while high-efficiency models can reach 12+.

Q3: Why 44.6 in the formula?
A: This converts the standard 20 BTU per square foot rule to metric (20 BTU/ft² ≈ 215 BTU/m² ≈ 44.6 W/m²).

Q4: Should I round up the result?
A: Yes, AC units come in standard sizes, so round up to the nearest available unit size.

Q5: Does this account for other factors?
A: This is a basic calculation. Consider insulation, windows, and heat sources for precise sizing.