Industry News

Developer Builds Prototype Net Zero Home Using Mitsubishi Electric Ductless Systems


Mitsubishi Electric Cooling & Heating was one of four manufacturers involved in Greenstone’s Net Zero Demonstration Project. Greenstone, a Washington-based housing developer, set out to build its first Certified Net Zero Home in 2017, as an effort to offer customers a high performance home with big energy savings. The residence is part of the Oak Harbor at Rock Hill neighborhood in Liberty Lake, Washington.

Aiming to reach a Home Energy Rating System (HERS®) score of zero, Greenstone knew choosing highly-efficient HVAC systems was essential. The team, along with local HVAC contractor, R & R Heating and Air Conditioning, Spokane, Washington, credit the following for the success of this project:

  1. Mitsubishi Electric’s Zoned Comfort Solutions™: Ductless heat pumps are used throughout different zones of the house. The units are so energy efficient that only one outdoor unit was needed to properly condition the home.
  2. Solar Panels: The number of solar panels on the roof produce enough energy to offset the electricity use in the house.
  3. Heat Recovery Ventilator (HRV): To supplement the HVAC system, Greenstone added a LIFEBREATH Indoor Air Systems HRV and air cleaner, which helps efficiently purify and elevate the indoor air quality.

In the end, the HVAC efficiencies helped this project receive the U. S. Environmental Protection Agency’s (EPA) Indoor airPLUS Qualification for high indoor air quality and a HERS score of negative six. With a typical new residential build averaging a score of 100, this is a huge accomplishment!

At Mitsubishi Electric, we’re proud to offer efficient solutions that benefit both our customers and the environment. The Greenstone team created a short video detailing the project.

Watch the video below