Room Size and Air Conditioner Capacity

Air Conditioner Capacity Formula:

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

AC Capacity (BTU/h):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Room Size to AC Capacity Calculator?

Definition: This calculator estimates the required air conditioner capacity in BTU/h based on room area in square feet.

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

2. How Does the Calculator Work?

The calculator uses the formula:

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

Where:

\( Q_{btu} \) — Air conditioner capacity (BTU/h)
\( A_{room} \) — Room area (square feet)

Explanation: The room area is multiplied by 139 BTU per square foot, which is a standard conversion factor for residential cooling needs.

3. Importance of Proper AC Sizing

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

4. Using the Calculator

Tips: Enter the room area in square feet. The value must be > 0. The result shows the recommended BTU rating for your air conditioner.

5. Frequently Asked Questions (FAQ)

Q1: Why 139 BTU per square foot?
A: This is a general rule of thumb for moderate climates. Adjustments may be needed for very hot climates, high ceilings, or rooms with many windows.

Q2: What if my room has special conditions?
A: For sunny rooms, add 10%; for shaded rooms, subtract 10%. Kitchens should add 4,000 BTU.

Q3: How does ceiling height affect the calculation?
A: For ceilings over 8 feet, multiply the result by (ceiling height ÷ 8).

Q4: What about room insulation?
A: Well-insulated rooms may require less capacity, while poorly insulated rooms may need more.

Q5: How do I convert BTU to tons?
A: 12,000 BTU = 1 ton of cooling capacity.