1. What is BTU/h in AC Units?

BTU/h (British Thermal Units per hour) measures an air conditioner's cooling capacity. One BTU represents the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.

2. How Does the Calculator Work?

The calculator uses the standard sizing formula:

Where:

• 20 — Standard factor representing BTU per square foot needed for cooling
• BTU/h — Cooling capacity of the AC unit

Explanation: This calculation estimates the square footage that can be effectively cooled by an AC unit of a given BTU rating.

3. Importance of Proper AC Sizing

Details: Proper AC sizing is crucial for energy efficiency and comfort. An undersized unit won't cool effectively, while an oversized unit will short-cycle, reducing efficiency and failing to properly dehumidify.

4. Using the Calculator

Tips: Enter the BTU rating of your AC unit to calculate the approximate square footage it can cool. For precise sizing, consider factors like ceiling height, insulation, and climate.

5. Frequently Asked Questions (FAQ)

Q1: Is 20 BTU/sq ft always accurate?
A: This is a general rule. Hotter climates may need 25-30 BTU/sq ft, while milder climates may need only 15-20 BTU/sq ft.

Q2: What size AC for a 1,000 sq ft home?
A: Approximately 20,000 BTU (1.5-2 tons) depending on climate and other factors.

Q3: How does ceiling height affect AC sizing?
A: Higher ceilings require more cooling capacity. For ceilings over 8 feet, increase BTU by 10% per additional foot.

Q4: What other factors affect AC sizing?
A: Insulation quality, window size/direction, local climate, and heat-producing appliances all impact sizing needs.

Q5: Should I round up or down when choosing an AC unit?
A: It's generally better to round up slightly rather than down to ensure adequate cooling capacity.