1. What is a Portable AC BTU Calculator?

Definition: This calculator estimates the cooling capacity needed for a portable air conditioner based on room size and environmental factors.

Purpose: It helps determine the appropriate BTU rating for a portable AC unit to effectively cool a given space.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Cooling load (BTU/h)
• \( A \) — Room area (square feet)
• \( \text{BTU/ft}^2 \) — Cooling requirement per square foot
• \( F \) — Adjustment factor for room conditions

Explanation: The base cooling requirement is calculated from room area and standard BTU/ft², then adjusted for specific conditions.

3. Importance of Proper BTU Calculation

Details: Correct BTU sizing ensures efficient cooling, proper humidity control, and energy efficiency. Undersized units run constantly, while oversized units short-cycle.

4. Using the Calculator

Tips: Enter room area in square feet, BTU/ft² (default 20), and adjustment factor (default 1.0). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the standard BTU/ft² value?
A: Typically 20 BTU/h per square foot, but may range from 15-25 depending on climate.

Q2: When should I adjust the factor?
A: Increase for sunny rooms (1.1), very sunny (1.2), kitchens (1.4), or for many occupants. Decrease for shaded rooms (0.9).

Q3: How do I measure room area?
A: Multiply length by width of the room in feet. Include adjoining spaces if not separated by doors.

Q4: What about room height?
A: This calculator assumes standard 8-foot ceilings. For higher ceilings, multiply result by (ceiling height ÷ 8).

Q5: Does this work for central AC?
A: The principles are similar, but central AC sizing requires professional Manual J calculation for ductwork and whole-home factors.