1. What is AC Unit Sizing?

AC unit sizing refers to determining the appropriate cooling capacity needed for a space, measured in tons of refrigeration. Proper sizing ensures efficient operation, optimal comfort, and energy savings.

2. How Does the Calculator Work?

The calculator uses the conversion formula:

Where:

• \( Ton \) — Tons of refrigeration
• \( BTU \) — British Thermal Units per hour (BTU/h)

Explanation: One ton of refrigeration equals 12,000 BTU/h, which is the amount of heat required to melt one ton of ice in 24 hours.

3. Importance of Proper AC Sizing

Details: Correct AC sizing is crucial for energy efficiency, proper humidity control, system longevity, and maintaining comfortable indoor temperatures. Oversized or undersized units can lead to higher energy costs and reduced comfort.

4. Using the Calculator

Tips: Enter the BTU/h value of your AC unit or cooling requirement. The calculator will convert it to tons of refrigeration. All values must be valid (BTU > 0).

5. Frequently Asked Questions (FAQ)

Q1: Why is 12,000 BTU/h equal to one ton?
A: This measurement comes from the amount of heat required to melt one ton (2000 pounds) of ice in 24 hours, which equals 12,000 BTU per hour.

Q2: What size AC unit do I need for my home?
A: Typical residential AC units range from 1.5 to 5 tons. A professional should perform a load calculation considering square footage, insulation, windows, and local climate.

Q3: Can I use this calculator for heat pumps?
A: Yes, the same conversion applies since heat pump capacity is also measured in tons and BTU/h for cooling mode.

Q4: What happens if my AC unit is oversized?
A: Oversized units short cycle (turn on/off frequently), reducing efficiency, increasing wear, and providing poor humidity control.

Q5: Are there other factors besides BTU for proper sizing?
A: Yes, professional sizing considers climate zone, insulation quality, window types, ceiling height, occupancy, and appliance heat loads.