Air Conditioning BTU per Square Foot

BTU Calculation Formula:

\[ Q = A \times \text{BTU/ft}^2 \]

Total Cooling Capacity (BTU/h):

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1. What is BTU per Square Foot Calculation?

Definition: This calculator determines the cooling capacity needed for a space based on its area and BTU requirements per square foot.

Purpose: It helps HVAC professionals and homeowners properly size air conditioning units for optimal performance and energy efficiency.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = A \times \text{BTU/ft}^2 \]

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 sizing prevents energy waste from oversized units and inadequate cooling from undersized units, while ensuring efficient operation.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU/ft² value?
A: For standard rooms, 20 BTU/h·ft² is common. Kitchens may need 30-40, while sunrooms might require 30-45 BTU/h·ft².

Q2: Does this account for room height?
A: Basic calculation doesn't. For high ceilings (>8 ft), increase BTU/ft² value or multiply by ceiling height factor.

Q3: What other factors affect BTU requirements?
A: Insulation quality, window size/direction, climate, occupancy, and heat-producing appliances all impact cooling needs.

Q4: How do I convert BTU to tons?
A: 1 ton of cooling = 12,000 BTU/h. Divide total BTU by 12,000 to get tons.

Q5: Should I round up the calculated BTU?
A: Yes, choose the next available unit size (most AC units come in standard capacities).