Energy Performance Scores: In New & Existing Homes

by: Michael Freels

Energy Performance Score (EPS) is:

• An energy performance scoring metric or rating (think of mpg for homes)
• A tool that works with all programs and all homes, regardless of their certifications
• Focused on the energy consumption and associated carbon for a home
  • Estimated energy costs
  • Lists energy-efficient features built into the home

EPS is NOT a certification, program, guarantee, cash incentive, or an alternative to ENERGY STAR®, Earth Advantage Homes Standard®, LEED® for Homes or any other certification program.

 Why was EPS developed?

To create an easy way to assess and compare important factors when buying a new home:

• Estimated utility costs
• Energy efficiency
• Environmental impact
• Motivate consumers to make energy-efficiency improvements

EPS provides value to homeowners:

• Allows home-to-home comparisons
• Provides clarity to energy efficiency claims
• Quantifies energy use on a scale
• Educates homebuyers/owners about a home’s energy use, environmental impact, estimated utility, costs and potential improvements

Various factors impact the EPS including: Insulation level,  Air leakage / Infiltration, Heating and cooling systems, Lighting, Water heating, Square footage, and Renewable energy systems such as solar.

 

EPS Calculation

REM/RateTM software is used to model the home

•  Measured or verified inputs include:
  •  Home size
  •  Insulation levels
  •  Air and duct leakage
  •  Heating and cooling systems
  •  Solar energy systems (if applicable)

• Assumed standardized conditions include:
  • Occupant behavior
  • Appliances
  • Thermostat settings
  • Number of occupants (based on bedroom count)

Why a carbon score?

• It helps homeowners make the connection between energy and the environment
• Increasing awareness of the effects of carbon on the environment
• Carbon is specific to the homeowner’s utility or utilities

EPS Score Sheet Example