1. What is a Room Size and AC Capacity Calculator?

Definition: This calculator estimates the required air conditioning capacity (in BTU/h) based on room area.

Purpose: It helps homeowners and HVAC professionals determine the appropriate AC unit size for a given room space.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q_{btu} \) — AC capacity (BTU per hour)
• \( A_{room} \) — Room area (square feet)

Explanation: The room area is multiplied by 139 BTU/ft², which is a standard conversion factor for residential cooling needs.

3. Importance of Proper AC Sizing

Details: Correct AC capacity ensures energy efficiency, proper cooling, and prevents overworking the unit. Undersized units won't cool effectively, while oversized units short-cycle and waste energy.

4. Using the Calculator

Tips: Enter the room area in square feet. The value must be > 0. The result shows the recommended AC capacity in BTU/h.

5. Frequently Asked Questions (FAQ)

Q1: Why 139 BTU per square foot?
A: This is a standard value for moderate climates. Adjustments may be needed for very hot climates, high ceilings, or rooms with significant heat sources.

Q2: What if my room has special conditions?
A: For rooms with high sunlight, kitchens, or server rooms, consider adding 10-20% to the calculated capacity.

Q3: How do I measure room area?
A: Multiply the room's length by width. Include only the space that will be cooled by this AC unit.

Q4: Does this work for whole-house AC?
A: This is designed for single rooms. Whole-house systems require professional Manual J calculations.

Q5: What about room height?
A: This assumes standard 8-9 ft ceilings. For taller ceilings, multiply the result by (ceiling height ÷ 8).