Air Conditioning Unit Size Calculator

AC Unit Size Formula:

\[ \text{Size (tons)} = \frac{\text{Area (sq ft)} \times 20}{12000} \]

AC Unit Size (tons):

Definition: This calculator estimates the required size (in tons) of an air conditioning unit based on the area to be cooled.

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

The calculator uses the formula:

\[ \text{Size (tons)} = \frac{\text{Area (sq ft)} \times 20}{12000} \]

Where:

Explanation: The area is multiplied by standard cooling needs (20 BTU/sq ft) and converted to tons of cooling capacity.

Details: Correct sizing ensures energy efficiency, proper humidity control, and prevents short cycling of the unit.

Tips: Enter the area to be cooled in square feet. The result shows the recommended AC unit size in tons.

Q1: Why 20 BTU per square foot?
A: This is a standard estimate for moderate climates. Adjustments may be needed for very hot or humid areas.

Q2: What if my ceiling height is unusual?
A: For ceilings over 8 feet, multiply the result by (ceiling height ÷ 8).

Q3: Should I round up the result?
A: AC units come in standard sizes (1.5, 2, 2.5, 3, 3.5, 4, 5 tons). Choose the next available size.

Q4: What about insulation quality?
A: Poor insulation may require 25-30 BTU/sq ft instead of 20. Good insulation may need only 15 BTU/sq ft.

Q5: Does this account for windows and sunlight?
A: No, for sun-facing rooms, add 10% to the calculated size. For shaded areas, subtract 10%.