Phius Calculators and Protocols Cover:

Energy Modeling

Energy Modeling

Phius provides a significant amount of protocol related to energy modeling for certification compliance and accuracy, as well as supplemental calculators that may be used to support building energy modeling.

Cost-Optimization

Cost-Optimization

Our tools, and specifically our project-specific performance criteria are centered around cost-optimized design. Be sure to check out our tool to estimate up-front cost premium and corresponding energy savings for new construction projects achieving Phius Certification.

Building Enclosure

Building Enclosure

Passive building places a high emphasis on the enclosure. Our toolset includes guidelines for moisture design for high performance enclosures, thermal bridge calculation methods, protocols, and calculators, as well as tools to assess for potential mold growth.

High-Performance Mechanical Systems

High-Performance Mechanical Systems

From climate-specific heat pump de-ration tools to domestic hot water equipment efficiency and piping distribution network calculators, our resource library covers it all.

General Support

General Support

Phius' library of calculators, protocols and supportive tools provide resources on detailed subjects as well as general support and tips throughout the design, certification and construction process.

Air-Tightness Testing Protocol

Air-Tightness Testing Protocol

The Certification Guidebook contains an appendix specifically on how to prepare the building for air-tightness testing according to ANSI/RESNET/ICC 380, as well as how to define and account for non-threatening air leakage.

Window Assessment

Window Assessment

Windows are generally the weakest point in the passive building enclosure. Phius has built tools to set maximum U-value requirements for windows based on comfort, as well as U-value constraints to minimize the risk of condensation on the interior surface of windows.

Multifamily Specific Guidance

Multifamily Specific Guidance

For multifamily projects pursuing Phius Certification, we have created a specific protocol and corresponding calculator for lighting and internal loads. The download set includes a sample project displaying the two methods supported in this protocol.

Continually Growing and Evolving

Phius and the high-performance building community are continually creating and updating tools that make passive building design and energy modeling more accurate, efficient, and optimized.
Browse All of the Latest Tools