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EER Formula:
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EER (Energy Efficiency Ratio) is a measure of how efficiently a cooling system operates when the outdoor temperature is at a specific level. It represents the ratio of cooling capacity (in BTU/hr) to power input (in watts).
The calculator uses the EER formula:
Where:
Explanation: The EER calculation provides a standardized way to compare the energy efficiency of different HVAC systems under specific operating conditions.
Details: EER is crucial for evaluating HVAC system efficiency, helping consumers choose energy-efficient units, reducing electricity costs, and minimizing environmental impact. Higher EER values indicate better energy efficiency.
Tips: Enter the cooling capacity in BTU/hr and the power consumption in watts. Both values must be positive numbers. The calculator will compute the EER ratio in BTU per watt.
Q1: What is a good EER rating?
A: EER ratings typically range from 8 to 12. Higher numbers indicate better efficiency. An EER of 10 or above is generally considered good for residential air conditioners.
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 with varying temperatures.
Q3: When is EER testing performed?
A: EER testing is conducted under standard conditions of 95°F outdoor temperature, 80°F indoor temperature, and 50% relative humidity.
Q4: Are there minimum EER requirements?
A: Yes, many regions have minimum EER requirements for HVAC equipment. These vary by location and equipment type, with standards often set by organizations like AHRI and DOE.
Q5: How can I improve my system's EER?
A: Regular maintenance, proper sizing, clean filters, adequate insulation, and upgrading to more efficient components can help improve your system's energy efficiency ratio.