1. What is the AC Tonnage Calculation?

The AC tonnage calculation estimates the cooling capacity needed for a space based on its square footage. One ton of cooling equals 12,000 BTU/hour.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Sq\,Ft \) — Area in square feet
• 25 — BTU per square foot (approximate)
• 12000 — BTU per ton of cooling

Explanation: The formula calculates the required cooling capacity by multiplying the area by 25 BTU/sq ft (a general rule of thumb) and then converting to tons.

3. Importance of Proper AC Sizing

Details: Proper AC sizing is crucial for energy efficiency and comfort. Undersized units run constantly, while oversized units short-cycle, reducing efficiency and dehumidification.

4. Using the Calculator

Tips: Enter the square footage of the space you need to cool. For more accurate results, consider factors like ceiling height, insulation, and climate.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation accurate for all situations?
A: This is a basic estimate. Professional Manual J calculations consider more factors like insulation, windows, and local climate.

Q2: What if my ceilings are higher than 8 feet?
A: You may need to increase capacity by about 10% for each additional foot of ceiling height.

Q3: How does insulation affect tonnage?
A: Well-insulated spaces may require less tonnage, while poorly insulated spaces may need more.

Q4: What about very sunny or shaded areas?
A: South-facing rooms with lots of windows may need 10-20% more capacity, while heavily shaded areas may need less.

Q5: Should I round up or down?
A: It's generally better to round up to the nearest half-ton for most residential applications.