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Seven Portland homes built to passive house standards will be open to the public this week for the 11th annual .

Free tours of the homes will take place Friday through Sunday during the event intended to publicize the European green building technique. Sponsors include the International Passive House Association, Passive House Northwest and the North American Passive House Network.

Passive house standards aim to reduce buildings’ energy consumption through thick insulation, draft elimination and mechanical ventilation. The building technique is mainstream in Europe, but slowly gaining momentum in Portland and other parts of the U.S.

More information and the latest list of Portland homes that will be open for tours during the event is available on the .

The current list of homes that will be open for tours are:

33 N. Beech St. #201 (apartment)

Open: Sunday, 2 to 4 p.m.

Contact: Brooke Budy, 503-438-8301 or [email protected]

134 N.E. 72nd Ave. (new single-family home)

Open: Sunday, 2 to 4 p.m.

Contact: Amanda Caffall, 503-893-8708

2515 S.E. Ankeny St. (townhome)

Open: Sunday, 1 p.m.

Contact: Dylan Lamar, 503-704-0387

539 S.E. 59th Court (retrofitted single-family home)

Open: Friday, by appointment only between 9 a.m. and 5 p.m.; Saturday and Sunday, 1 to 5 p.m.

Contact: Maria or Tad Everhart, 503-239-8961

4237 S.E. 37th Ave. (community building in Kailash Ecovillage)

Open: Saturday, 10 a.m. to 5 p.m.

Contact: Maitri Ersson, 971-219-1813 or [email protected]

2145 S.E. Brooklyn St. (new single-family home)

Open: Friday, 1 to 5 p.m.; Saturday and Sunday, 9 a.m. to 5 p.m.

Contact: Matthew or Kathy Bradburn, 503-381-0134

4400 N.E. Skidmore St. (single-family home)

Open: Saturday, 10 a.m. to noon

Contact: Jeff Stern, 503-957-3172