Resource Library

Phius Policy Specialist Zoe Rader provides updates on Phius policies throughout the country and their impact on project Certification.

Phius Certification Team members Margaret Goetsch and James Ortega answer project questions.

This edition of the Phius Project Spotlight Series highlights the Bush School - Upper School South project in Seattle, Washington.

Phius Certification Manager Al Mitchell discusses climate and weather data relevant to passive building design.

Experienced Phius professional Galen Staengl outlines strategies for addressing make-up air requirements for Phius multifamily projects.

A recap of Phius' accomplishments, new initiatives and key projects in 2025.

A pair of Phius staff members who attended NESEA's BuildingEnergy Boston 2026 conference share their thoughts and observations from the event.

This blog provides a breakdown of financial incentives for Phius training and two upcoming in-person training courses in Colorado.

Use this estimator to determine a climate-adjusted coefficient of performance (COP) for the Aegis A CO2 Heat Pump Water Heater. This estimator also includes instructions on modeling storage losses associated with water storage tanks per Lync by WATTS' available products. This estimator is applicable for the 250, 350 and 500 models.

Use this estimator to determine a climate-adjusted coefficient of performance (COP) for the Transom Heat Pump Water Heater. This estimator is applicable for the V105, V210 and V420 models.