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Passive Project

Passive Project Window Install

Extreme Energy Efficiency with a German Twist

The Passive Project takes all of the lessons learned during the build of the 100K House Project, while taking the envelope to the next level. The German Passiv Haus standard is employed to reduce heating and cooling loads by 90% this time around.

Passive House Design

Using the requirements of the Passive House standard to reach unprecedented efficiency.

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A First in Philly and PA

While there are thousands of Passive Houses in Europe, there are only about a dozen in the States as of 2008. Postgreen is the first to bring the Passiv Haus standard to Philadelphia and all of PA.

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M&M+ Original Floorplan
M&M+ Original Floorplan

Utility Bill

  • $0 (projected annually)

Insulation Levels

Under Slab: R-50
Foundation Walls: R-10
Walls: R-32
Roof: R-53
Windows: R-9

Passive Project Foundation

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Mechanical Systems

  • Schuco Slimline II-80 Solar Thermal Hot Water
  • LG Art Cool Split Ductless Air-to-Air Heat Pump
  • Ultimate Aire Recouperator 200DX ERV
  • 2.04 KW PV Array

Water Efficiency

  • Dual Flush Toilets
  • Low-Flow Showerhead
  • Low-Flow Bath Fixtures
  • Rainwater Cistern
  • High Efficiency Dishwasher and Clothes Washer

Solar Shading

We were shocked to see that designing proper external window shading for the Passive Project reduced the cooling demand by 77%. The cooling load was so small already, that we barely need any active air conditioning at all in the homes.

Air Sealing

Most homes in the US leak like a sieve, but the Passiv Haus standard demands an air tight barrier that surrounds the entire building. Caulk and spray foam don’t cut it here. The Passive Project uses plenty of tape and air barrier material (poly & Tyvek) to keep the heating and cooling demands to a bare minimum.

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Project Team

developer/builder – Postgreen Homes
architect – interface studio architects llc
sustainable cabinetry – pappajohn woodworking
landscape architect – Studio Bryan Haynes
sales team – stokes group
Passive House Consultant – PHIUS (Passive House Institute of the US)
Structural Engineer – Larsen & Landis

Award Winning Architecture

Multi-AIA award winning architecture firm Interface Studio Architects has developed their next facade style, the Kensington Tiger, for Postgreen Homes and the Passive Project. Don’t worry, it doesn’t bite.
kensington tiger facade

Professionally Designed Landscaping

Local landscape architecture firm Studio Bryan Haynes is providing unique and modern landscape designs for today’s urban lifestyles.

Size & Design

Units: 2
Stories: 2
Facade: Kensington Tiger
Footprint: 17.5′ x 42′
Exterior Square Footage: 1,470
Interior Square Footage: 1,296


2318-20 Amber St.
Philadelphia, PA 19125
View 100K House Walks Fishtown in a larger map

Passive Project Gallery

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