1. What is Energy Use Index?

The Energy Use Index (EUI) is a measure of a building's energy consumption relative to its size. It represents the amount of energy (in kWh) used per square foot annually, allowing for comparison between buildings of different sizes.

2. How Does the Calculator Work?

The calculator uses the Energy Use Index formula:

Where:

• Energy Consumption — Total energy used in kilowatt-hours (kWh)
• Area — Total floor area in square feet (ft²)

Explanation: The equation calculates energy efficiency by normalizing energy consumption by building size.

3. Importance of Energy Use Index

Details: EUI is crucial for benchmarking energy performance, identifying efficiency opportunities, and tracking progress in energy conservation efforts across different states with varying climate conditions.

4. Using the Calculator

Tips: Enter total annual energy consumption in kWh, total floor area in square feet, and select your state. All values must be valid (energy > 0, area > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is a good Energy Use Index?
A: Typical EUI values vary by building type and climate zone. Office buildings might range from 50-150 kWh/ft²/year, while hospitals might be 200-300 kWh/ft²/year.

Q2: Why include state in the calculation?
A: Different states have different climate conditions that significantly affect energy use. This allows for more accurate benchmarking against similar buildings in your region.

Q3: What time period should energy consumption cover?
A: Typically a full year to account for seasonal variations. For new buildings, use projected annual consumption.

Q4: What area should be included?
A: Total conditioned floor area, including all floors. Exclude parking garages and other unconditioned spaces.

Q5: How can I improve my EUI?
A: Energy efficiency measures like LED lighting, HVAC upgrades, better insulation, and renewable energy installations can all help reduce EUI.