1. What is EER?

EER (Energy Efficiency Ratio) is a measure of how efficiently a cooling system operates when the outdoor temperature is at a specific level (usually 95°F). It's calculated by dividing the cooling capacity (in BTU/h) by the power input (in watts).

2. How Does the Calculator Work?

The calculator uses the EER formula:

Where:

• Cooling Capacity — The system's cooling power in British Thermal Units per hour (BTU/h)
• Power Input — The electrical power consumed by the system in Watts

Explanation: Higher EER values indicate more efficient air conditioning systems that provide more cooling per watt of electricity consumed.

3. Importance of EER Calculation

Details: EER helps consumers compare the energy efficiency of different HVAC systems. Higher EER ratings typically mean lower operating costs, though they may come with higher initial purchase prices.

4. Using the Calculator

Tips: Enter the cooling capacity in BTU/h (found on the system's specification sheet) and the power input in watts. Both values must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What's a good EER rating?
A: Residential systems typically range from 8 to 12. Higher is better. ENERGY STAR certified models usually have EER of 12 or higher.

Q2: How does EER differ from SEER?
A: EER measures efficiency at one operating temperature (95°F), while SEER (Seasonal EER) measures average efficiency over an entire cooling season.

Q3: Should I always choose the highest EER system?
A: Not necessarily. Consider your climate, usage patterns, and budget. The highest EER systems may have longer payback periods.

Q4: Can EER be improved after installation?
A: Yes, through proper maintenance, duct sealing, shading, and using programmable thermostats to optimize operation.

Q5: Does EER apply to heat pumps?
A: Yes, though heat pumps also have HSPF (Heating Seasonal Performance Factor) for heating efficiency.