1. What is the AC Size Calculator?

The AC Size Calculator estimates the required cooling capacity (in tons) for a space based on its square footage. This is a basic rule-of-thumb calculation used in HVAC sizing.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( Tons \) — Cooling capacity in tons (1 ton = 12,000 BTU/hr)
• \( Area \) — Area to be cooled in square feet

Explanation: This formula assumes a standard cooling load of about 1 ton per 600 square feet in moderate climates.

3. Importance of Proper AC Sizing

Details: Proper AC sizing is crucial for energy efficiency, comfort, and equipment longevity. Oversized units short-cycle, while undersized units run constantly.

4. Using the Calculator

Tips: Enter the total area to be cooled in square feet. For more accurate results, consider additional factors like insulation, climate, and sun exposure.

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 for precise sizing.

Q2: What if my home has high ceilings?
A: For ceilings over 8 feet, you may need to increase capacity by 10-20% per additional foot.

Q3: How does climate affect AC sizing?
A: Hotter climates may require 1 ton per 400-500 sq ft, while milder climates may use 1 ton per 700-800 sq ft.

Q4: What about multi-story homes?
A: Each floor should be calculated separately, as upper floors typically require more cooling.

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