1. What is a BTU AC per Square Foot Calculator?

Definition: This calculator estimates the cooling capacity needed for an air conditioning system based on the area to be cooled and BTU requirements per square foot.

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:

Where:

• \( Q \) — Total cooling capacity (BTU/h)
• \( A \) — Area to be cooled (square feet)
• \( \text{BTU/ft}^2 \) — Cooling requirement per square foot (BTU/h·ft²)

Explanation: The area is multiplied by the BTU requirement per square foot to determine the total cooling capacity needed.

3. Importance of Proper BTU Calculation

Details: Correct BTU calculation ensures efficient cooling, proper humidity control, and energy efficiency. An undersized unit won't cool properly, while an oversized unit will short-cycle.

4. Using the Calculator

Tips: Enter the area in square feet and BTU requirement per square foot (default 20 BTU/h·ft² for residential spaces). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU per square foot requirement?
A: For residential spaces, 20 BTU/h per square foot is common, but this varies based on climate, insulation, and room type.

Q2: When would I need more BTU per square foot?
A: In hot climates, for sunny rooms, kitchens, or poorly insulated spaces, you might need 25-30 BTU/h per square foot.

Q3: Does this include other factors like windows or occupancy?
A: No, this is a basic calculation. For precise sizing, consider additional factors like window area, ceiling height, and room usage.

Q4: How do I measure the area accurately?
A: Measure length × width of the space, excluding closets and other unconditioned areas.

Q5: Is this calculation suitable for central AC systems?
A: This provides a rough estimate. Professional Manual J calculations are recommended for central systems.