1. What is the AC Size Calculation?

The AC size calculation determines the cooling capacity needed for a space based on its square footage. Proper sizing is crucial for energy efficiency and comfort.

2. How Does the Calculator Work?

The calculator uses the standard formula:

Where:

• \( Area \) — Floor area in square feet
• 25 — BTU per square foot (standard value)
• 12000 — BTU per ton of cooling

Explanation: The formula converts the total BTU requirement (area × 25) into tons of cooling capacity (1 ton = 12,000 BTU).

3. Importance of Proper AC Sizing

Details: Correct AC sizing ensures energy efficiency, proper humidity control, and system longevity. Oversized units short cycle, while undersized units run constantly.

4. Using the Calculator

Tips: Enter the total square footage of the area to be cooled. For multi-room calculations, sum the area of all connected spaces.

5. Frequently Asked Questions (FAQ)

Q1: What if my ceiling height is unusual?
A: For ceilings over 8 feet, multiply the result by (ceiling height ÷ 8).

Q2: Does this account for insulation quality?
A: No, this is a basic calculation. Poor insulation may require 30 BTU/sq ft instead of 25.

Q3: What about windows and sunlight exposure?
A: South-facing rooms or large windows may need adjustment. Add 10% for significant sun exposure.

Q4: Is this calculation for central AC or window units?
A: This calculates total cooling capacity needed. For multiple window units, divide the total tons by number of units.

Q5: Should I round up the result?
A: HVAC units come in standard sizes (1.5, 2, 2.5, 3 tons etc.). Round to nearest available size, but consult an HVAC professional.