1. What is EER?

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:

• \( BTU/h \) — British Thermal Units per hour (cooling capacity)
• \( Watts \) — Electrical power input

Explanation: Higher EER values indicate more efficient air conditioning systems when operating at the specified outdoor temperature.

3. Importance of EER Calculation

Details: EER helps consumers compare the energy efficiency of different HVAC systems and estimate potential energy savings. It's particularly important in hot climates where cooling systems run frequently.

4. Using the Calculator

Tips: Enter the cooling capacity in BTU/h and power input in Watts from your HVAC system's specifications. Both values must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is a good EER rating?
A: Generally, an EER of 12 or higher is considered excellent for residential systems, while 8-11 is average.

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

Q3: Where can I find my system's BTU and Watts ratings?
A: Check the manufacturer's specifications, the EnergyGuide label, or the unit's nameplate.

Q4: Does higher EER always mean better?
A: While higher EER indicates better efficiency, higher-rated systems may cost more upfront. Consider your climate and usage patterns.

Q5: Can I use this for heat pumps?
A: Yes, but only for the cooling mode. Heat pumps have separate efficiency ratings for heating (HSPF).