1. What is AC Unit Tonnage?

AC unit tonnage refers to the cooling capacity of an air conditioning system, measured in tons. One ton of cooling equals 12,000 BTU per hour. Proper tonnage sizing is crucial for efficient cooling and energy consumption.

2. How Does the Calculator Work?

The calculator uses the standard tonnage formula:

Where:

• \( Square\ Footage \) — Total area to be cooled in square feet
• \( 400 \) — Standard conversion factor (sq ft per ton)

Explanation: This formula provides a basic estimate for residential AC sizing, assuming standard ceiling heights and insulation levels.

3. Importance of Proper AC Sizing

Details: Correct AC tonnage ensures optimal energy efficiency, proper humidity control, extended equipment lifespan, and consistent comfort levels throughout the space.

4. Using the Calculator

Tips: Enter the total square footage of the area to be cooled. For multi-story buildings, calculate each floor separately and sum the results. Consider additional factors like ceiling height and insulation quality.

5. Frequently Asked Questions (FAQ)

Q1: Why is 400 sq ft per ton used as the standard?
A: This is a general rule of thumb for well-insulated homes with standard 8-foot ceilings in moderate climates.

Q2: What factors can affect the required tonnage?
A: Ceiling height, insulation quality, window size/direction, climate zone, number of occupants, and heat-generating appliances.

Q3: What happens if I install an oversized AC unit?
A: Oversized units cycle on/off frequently, leading to poor humidity control, higher energy costs, and reduced equipment lifespan.

Q4: What about undersized AC units?
A: Undersized units run continuously, struggle to maintain temperature, increase wear and tear, and may not adequately cool the space.

Q5: Should I consult a professional for final sizing?
A: Yes, this calculator provides an estimate. Professional HVAC contractors perform detailed Manual J calculations for precise sizing.