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 — Measured in British Thermal Units per hour (BTU/h)
• Power Input — Measured in Watts (W)

Explanation: Higher EER values indicate more efficient air conditioning systems when operating at the rated conditions.

3. Importance of EER Calculation

Details: EER helps consumers compare the energy efficiency of different HVAC systems. A higher EER means lower electricity consumption for the same cooling output, resulting in lower operating costs.

4. Using the Calculator

Tips: Enter the cooling capacity from your system's specifications (in BTU/h) 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 for residential AC?
A: For residential systems, EER ratings typically range from 8 to 12. Higher is better, with ENERGY STAR certified models usually having 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 efficiency over an entire cooling season at varying temperatures.

Q3: When is EER most useful?
A: EER is particularly important in hot climates where systems operate near peak capacity frequently.

Q4: Can I use this for heat pumps?
A: This calculation works for cooling mode of heat pumps, but heating efficiency is measured differently (HSPF).

Q5: How much can a higher EER save me?
A: Moving from EER 8 to EER 12 can reduce cooling costs by about 33%, though initial costs may be higher for more efficient units.