1. What is BTU?

BTU (British Thermal Unit) is a unit of heat defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. In HVAC systems, BTU measures the heating or cooling capacity of equipment.

2. How BTU is Calculated

The standard calculation for heat pump capacity:

Where:

• 1 ton of cooling capacity = 12,000 BTU/hour
• 3 tons = 36,000 BTU/hour

Explanation: This conversion comes from the original definition where 1 ton of refrigeration equals the heat absorption of melting 1 ton of ice in 24 hours.

3. Importance of BTU Calculation

Details: Proper BTU calculation ensures your heat pump is correctly sized for your space. Undersized units won't heat/cool effectively, while oversized units short-cycle, reducing efficiency and comfort.

4. Using the Calculator

Tips: This calculator automatically calculates BTU for a standard 3-ton heat pump. For other sizes, modify the tons value (though the calculator is preset for 3 tons).

5. Frequently Asked Questions (FAQ)

Q1: Why is 1 ton equal to 12,000 BTU?
A: This dates back to when cooling was measured by ice melting - 1 ton of ice melting over 24 hours absorbs 12,000 BTU per hour.

Q2: Is higher BTU always better?
A: No, proper sizing is crucial. Oversized units cycle on/off too frequently, reducing efficiency and failing to properly dehumidify.

Q3: How many square feet will 36,000 BTU heat?
A: Approximately 1,500-2,000 sq ft, depending on climate, insulation, and other factors. Professional load calculation is recommended.

Q4: What's the difference between BTU and SEER?
A: BTU measures capacity, while SEER (Seasonal Energy Efficiency Ratio) measures efficiency (BTU of cooling per watt-hour of electricity).

Q5: Can I use this for air conditioners too?
A: Yes, the BTU calculation works the same for both heat pumps and air conditioners.