1. What is EER in HVAC?

The Energy Efficiency Ratio (EER) 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 amount of heat an AC unit can remove from a space per hour (BTU/h)
• Power Input — The electrical energy consumed by the AC unit (watts)

Explanation: A higher EER rating indicates better energy efficiency and lower operating costs.

3. Importance of EER Calculation

Details: EER is crucial for comparing the energy efficiency of different HVAC systems, estimating operating costs, and making informed purchasing decisions. Higher EER ratings typically mean lower electricity bills.

4. Using the Calculator

Tips: Enter the cooling capacity in BTU/h and power input in watts. Both values must be positive numbers. The calculator will compute the EER ratio.

5. Frequently Asked Questions (FAQ)

Q1: What is a good EER rating?
A: For residential units, EER ratings typically range from 8 to 12. Higher values indicate better efficiency. Energy Star certified models usually have EER ratings of 12 or higher.

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

Q3: Where can I find the cooling capacity and power input values?
A: These values are typically listed on the manufacturer's specification sheet or on the unit's energy guide label.

Q4: Does a higher EER always mean better performance?
A: While higher EER indicates better energy efficiency, it's important to also consider factors like proper sizing, installation quality, and maintenance for overall system performance.

Q5: Can EER be improved for existing systems?
A: Regular maintenance, cleaning filters, ensuring proper refrigerant levels, and shading the outdoor unit can help maintain or slightly improve EER performance.