1. What is Energy Efficiency Ratio?

The Energy Efficiency Ratio (EER) is a measure of how efficiently a cooling system operates when the outdoor temperature is at a specific level. It is commonly used to rate the efficiency of air conditioners and heat pumps.

2. How Does the Calculator Work?

The calculator uses the EER formula:

Where:

• \( BTU/hr \) — British Thermal Units per hour (cooling capacity)
• \( Watts \) — Electrical power consumption in watts

Explanation: EER represents the ratio of cooling output (in BTU/hr) to electrical power input (in watts). Higher EER values indicate more efficient systems.

3. Importance of EER Calculation

Details: EER is crucial for comparing the energy efficiency of different cooling appliances, helping consumers make informed purchasing decisions and reduce energy costs.

4. Using the Calculator

Tips: Enter the BTU/hr rating and wattage consumption from the appliance specifications. Both values must be greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a good EER rating?
A: Generally, EER ratings of 10 or higher are considered good, with higher numbers indicating better efficiency. Modern high-efficiency units can reach EER values of 12 or more.

Q2: How does EER differ from SEER?
A: EER measures efficiency at a specific outdoor temperature (usually 95°F), while SEER (Seasonal Energy Efficiency Ratio) measures efficiency over an entire cooling season.

Q3: When is EER testing performed?
A: EER is typically measured under standard laboratory conditions with 95°F outdoor temperature and 80°F indoor temperature at 50% relative humidity.

Q4: Are there minimum EER requirements?
A: Yes, many regions have minimum EER requirements for air conditioners set by energy efficiency standards and building codes.

Q5: Can EER be used for heating systems?
A: EER is primarily for cooling systems. Heating systems typically use HSPF (Heating Seasonal Performance Factor) or COP (Coefficient of Performance) ratings.