The World's Leading Building Energy Standard

PHI Passivhaus Logo

Passive House is the most comfortable, economical and energy efficient building standard in the world.

Passive House aims to reduce energy in buildings by up to 90% while providing superior comfort and indoor environmental quality. It successfully insulates the owner from ongoing utility costs with measurable performance. When combined with renewable energy systems such as solar photovoltaic or solar thermal, Passive House puts true zero energy buildings and carbon neutrality within reach, making Passive House the leapfrog building design approach.


We designed the Passive House in the Woods project, the first certified Passive House in Wisconsin.

Passive House (pas′iv-ho̵us) for New Construction

The name Passive House is derived from the German term “Passivhaus”, which describes a building with virtually no heating system (passive heating), versus a conventional building a with large heating system (active).

Energy Conservation First

Passive House is an “energy conservation first” approach. The basic idea is to radically minimize heat loss through effective heat retention, and maximize passive solar and internal heat gains. In our local climate, the sun can provide up to 50%, or more of the energy needed to heat a Passive House. Internal heat gains provide an additional 15%, making a traditional heating system with furnace or boiler obsolete.



Super insulated walls and triple-pane windows enable the house to maintain a constant, comfortable temperature.

Gas Mileage for Buildings

The Passive House building energy standard introduces a gas mileage for buildings. It is measured in kWh per square meter and year globally, and kBtu per square foot and year in the U.S. The limit for heating and cooling energy is 15 kWh , or 4.75 kBtu—a reduction of up to 90% over conventional buildings. Source energy accounted for at the utility company is limited to 120 kWh per square meter and year, or 38 kBtu per square foot and year. This represents on average an 80% reduction.

For its leapfrog approach to building and outstanding performance, the European Union is now implementing Passive House performance as code for its member countries.

Predictable Performance

Designs are modeled with a scientific energy modeling software called the “Passive House Planning Package”, and field-tested for various parameters during and after construction. Design and field testing are submitted to a Passive House certifier for review and building certification. Using the PHPP enables us to deliver predictable performance to our clients, which sets us apart from the competition.


Smoke testing helps identify and plug leaks, improving the quality of the building envelope.


A blower door test measures airtightness–a key component in maintaining comfort and durability.

EnerPHit for Retrofit Projects

EnerPHit logo

At TE Studio we often combine remodels, additions, and other deferred maintenance upgrades with an energy retrofit for a holistic design that brings your project up to cutting edge levels of design and performance. We use Passive House tools to generate predictable results, and take great care to enhance what’s good while solving what is not.

A comprehensive retrofit project aims to provide you with lower utility bills, a significantly reduced energy footprint, much more comfort, better indoor environmental quality, more durability and less maintenance in a functional and beautiful environment. Whether you are looking to remodel a little or go all the way, we can help you assess your current building, and work with you to arrive at a design solution that fits your needs today and in the future.

Learn more about Retrofitting

Deep Energy Reduction Retrofit with Passive House Tools – A Primer

An EnerPHit home will be 4-6 times more energy efficient than a conventionally built new home.  Because the standard targets the existing housing stock, it’s entirely possible that a remodeled home will perform at 10X its previous efficiency. EnerPHit is the official retrofit standard introduced by the Passive House Institute that we offer to our clients. At TE Studio, we designed the first EnerPHit (Passive House Retrofit) project in a cold climate zone anywhere in the word.

TE Studio: Certified Passive House Design and Consulting

The Passive House Standard is the most rigorous building energy standard in the world. Consultants, projects or building components that have obtained the right to carry the logo have committed themselves to design excellence and the Passive House energy performance criteria.

Tim Delhey Eian of TE Studio is certified in the U.S. as a Certified Passive House Consultant, and globally as a Certified Passive House Designer by the Passivhaus Institut in Darmstadt, Germany.

CPHD_Designer_EN  PH certification mark_M

Learn more about Passive House

Passive House Primer

Passive House Benefits

Passive House Metrics

What does a Passive House cost?

Energy Independence with Passive House

Passive House vs. Passive Solar Design

Deep Energy Reduction Retrofit with Passive House Components

Why Airtight Buildings?

Official Passive House Websites


PHI (Passiv Haus Institut)

PHIUS (Passive House Institute U.S.)

International Passive House Association

Passive House Alliance

Passive House Minnesota