Smart homeownership made simple

Smart homeowners realize the value of a home that saves energy. Energy-efficient homes offer lower energy costs, increased comfort and a reduced environmental impact. EPSTM, brought to you by Energy Trust of Oregon, is an energy performance scoring tool that rates a home’s energy consumption, energy costs and carbon footprint. The lower the score, the more efficient the home.

Want an EPS for your current home?

Find a local EPS Rater who will use diagnostic equipment to test and evaluate your home’s interior and exterior and help you see how all aspects of your home—from your heating system to windows—work together.

EPS raters are specially trained and certified to offer EPS, courtesy of Energy Trust.

View a sample EPS sheet »

Smart ways to get the most from EPS

  1. Receive an EPS from an EPS rater, who will test and evaluate all aspects of your home.
  2. Make energy-saving improvements recommended by your EPS rater.
  3. After the improvements are complete, your contractor will re-assess your home, and you’ll receive an updated EPS showing your new score, estimated monthly energy costs and carbon footprint.

Look for these common features in homes with low scores

A range of strategies can be used to boost energy efficiency, minimize energy costs and reduce environmental impact. The following features can be found in homes boasting low energy scores:

Improved insulation

Properly installed attic/ceiling, floor and wall insulation can help keep heat inside during winter and outside during summer. Insulation is given a rating that reflects its resistance to heat flow; the greater the number, the better the insulating quality. Energy Trust recommends an R-Value of at least R-38 for attics/ceilings, R-11 for walls and R-30 for floors. Look for the R-Value on the home’s EPS sheet to see how efficient the insulation is.

Efficient windows

The rate of heat loss in windows is indicated by their U-Value. The lower the U-Value, the greater a window's resistance to heat flow and the better its insulating properties. The result is a more comfortable home and greater energy efficiency. Energy Trust recommends windows with a U-Value of 0.25 or less.

Properly sealed ducts

A tightly built home matched with an approved ventilation system reduces unwanted air exchanges between the house, crawl space, attic and outdoors, which keeps the air in the home cleaner—helping to reduce allergens and potential mold. This allows for a safer, healthier and more comfortable indoor environment.

Efficient appliances and lighting

ENERGY STAR® qualified appliances use up to 25 percent less energy than standard models. Compact fluorescent lighting uses up to 75 percent less energy than standard incandescent lighting, while LEDs use up to 85 percent less energy.

Efficient heating, cooling and ventilation

Energy-efficient furnaces and other equipment provide superior heating, cooling and ventilation and can lower energy costs, enhance comfort and improve indoor air quality.

The energy efficiency of appliances and mechanical equipment is measured in different terms. Reference the list below to find brief descriptions of these metrics and the information they provide:

  • Furnace efficiency is measured using annual fuel utilization, AFUE, a laboratory-derived efficiency rating for heating appliances. A higher AFUE indicates a more energy-efficient model.
  • Heat pump efficiency is rated using heating seasonal performance factor, HSPF. A higher HSPF indicates a more energy-efficient model.
  • Air conditioner efficiency is rated using seasonal energy efficiency ratio, SEER. The higher the SEER rating, the more energy efficient the cooling.

Water heating

ENERGY STAR qualified water heaters can save up to 30 percent on a home’s water heating costs and still ensure comfort. Water heater efficiency is measured by energy factor, EF. The higher the EF, the more energy efficient the model.

Solar electric

Solar panels use the sun to heat water or convert its rays into electricity to help meet your energy needs, reducing the amount of energy you need to buy. Learn more about solar electric.

Envelope Tightness

A Blower Door test assesses the tightness of a home, measuring the home’s air leakage in cubic feet per minute at 50 pascals (CFM50). The higher the measurement number, the more likely there is a high rate of air leakage occurring in your home.