Air Conditioning Calculation Formula

Cooling Capacity Formula:

\[ Q_{btu} = A_{room} \times 139 \]

Cooling Capacity (BTU/h):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Air Conditioning Calculation Formula?

Definition: This calculator estimates the cooling capacity needed for an air conditioner based on room area.

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:

\[ Q_{btu} = A_{room} \times 139 \]

Where:

\( Q_{btu} \) — Cooling capacity (BTU/hour)
\( A_{room} \) — Room area (square feet)

Explanation: The room area is multiplied by 139 BTU per square foot, which is a standard estimate for moderate climates.

3. Importance of Proper AC Sizing

Details: Correct cooling capacity calculation ensures energy efficiency, proper humidity control, and system longevity.

4. Using the Calculator

Tips: Enter the room area in square feet. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why 139 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 factors can affect this calculation?
A: Ceiling height, insulation quality, window size/direction, climate, and heat-generating appliances.

Q3: Should I round up the calculated BTU value?
A: Yes, it's recommended to round up to the nearest standard AC unit size (e.g., 5,000, 8,000, 12,000 BTU).

Q4: How does this change for different rooms?
A: Kitchens may need +4,000 BTU, while bedrooms may need slightly less than calculated.

Q5: What if my room has high ceilings?
A: For ceilings over 8 feet, multiply the result by (ceiling height ÷ 8).