1. What is an AC Size Calculator?

Definition: This calculator determines the required air conditioner size in tons based on the cooling capacity in BTU/h (British Thermal Units per hour).

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• 1 ton of cooling = 12,000 BTU/h
• BTU/h — British Thermal Units per hour (cooling capacity)

Explanation: The BTU rating is divided by 12,000 to convert to tons, which is the standard unit for AC sizing.

3. Importance of Proper AC Sizing

Details: Correct sizing ensures energy efficiency, proper humidity control, and prevents short cycling. Oversized units waste energy while undersized units struggle to cool.

4. Using the Calculator

Tips: Enter the total cooling capacity needed in BTU/h. The calculator will determine the equivalent size in tons.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine the BTU needed for my space?
A: As a rough estimate, you need about 20 BTU per square foot, but this varies based on climate, insulation, and other factors.

Q2: What's the difference between BTU and tons?
A: Tons measure cooling capacity where 1 ton = 12,000 BTU/h. This historical measurement comes from the cooling effect of melting 1 ton of ice in 24 hours.

Q3: What size AC do I need for a 1,500 sq ft home?
A: Approximately 30,000 BTU (2.5 tons), but a professional load calculation is recommended for accurate sizing.

Q4: Can I use this for heat pumps?
A: Yes, the same calculation applies to heat pumps in cooling mode.

Q5: Why is proper AC sizing important?
A: Proper sizing affects energy efficiency, equipment lifespan, comfort, and humidity control. Oversized units cycle too frequently while undersized units run constantly.