Phius Window and Door Certification Program
Phius
Phius certifies high-performance windows and doors for passive building.
Key Strengths
- Product-specific thermal performance data at any dimension, not just standard sizes
- No physical testing required — certification accessible with or without existing test data
- Third-party verified performance values increase credibility with practitioners
- Direct product visibility in the Phius Certified Product Database
- Datasheets available in both IP and SI units for modeling software compatibility
- Streamlines energy modeling and project review for passive building professionals
Ideal For
This certification is best suited for window, door, and skylight manufacturers seeking to differentiate their products in the high-performance and passive building market. It is also valuable for building professionals, architects, and energy modelers who need precise, product-specific thermal performance data for Phius or passive house projects.
Target Audiences
Relevant Roles
Industries
Alignment & Recognition
Product Categories
Overview
The Phius Window & Door Certification Program is designed to provide passive building professionals with certified, high-performance fenestration products. These certified windows, doors, and skylights offer product-specific, component-level thermal performance data that can be used in energy models without needing estimates or assumptions. This allows for precise modeling based on specific dimensions, enhancing project accuracy.
For manufacturers, the Phius certification positions products as leaders in the high-performance building sector. It offers verified performance data that’s not readily available elsewhere, making the products more appealing to practitioners who need reliable information for their energy modeling software. Certification does not require physical testing, and products can be certified with or without existing certifications.
For building professionals, Phius-certified windows and doors provide Phius-verified performance data, saving time on documentation and streamlining project reviews. While not mandatory for Phius-certified projects, these products offer significant benefits, including time savings and enhanced accuracy during energy modeling. Additionally, Phius-certified products are featured in the Phius Certified Product Database, making them accessible to end-users directly.
The certification process offers several benefits for both manufacturers and practitioners, including third-party verified data, product-specific datasheets in both IP and SI units, and recognition as a trusted component in passive building designs. By choosing Phius-certified fenestration products, professionals gain confidence in their thermal performance while manufacturers expand their marketplace reach, contributing to the growth of high-performance, energy-efficient building solutions.
Requirements & Verification
Evidence Requirements
Manufacturers must submit product specifications and thermal performance data for review by Phius. No physical testing is required; existing performance data or manufacturer-provided data is reviewed and verified by the Phius product certification team. Products are evaluated for component-level thermal performance at variable dimensions.
Prerequisites
Assessment Process
Phius staff review manufacturer-submitted product performance data and specifications. No physical testing is required. The Phius product certification team verifies thermal performance values at component level and across variable product dimensions. Upon approval, products are listed in the Phius Certified Product Database with product-specific datasheets in IP and SI units.
Consider Alternatives If...
Manufacturers whose products are not targeting the high-performance or passive building market may find limited ROI from this certification. If a project does not require Phius-level fenestration performance data, standard NFRC ratings may be sufficient.
Alternative Programs
Frequently Asked Questions
Quick Facts
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