Resource Library

The Phius Certification Guidebook is the one-stop-shop for all things related to the Phius project certification program.

Use this estimator to determine if a building targeting Phius Certification is required to provide a dedicated make-up air system when using intermittent direct exhaust systems such as exhaust dryers or exhaust kitchen range hoods.

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.

Use this estimator to determine a climate-adjusted coefficient of performance (COP) for the Ice Air ccHPWH. This estimator is applicable for the 275-D-B, 275-S-B, 550-D-B and 550-S-B models.

This estimator should be used to determine average and design occupancy of non-residential and non-residential portions of mixed-use projects.

Use this estimator to determine the auxiliary energy associated with an active snow-melt system.

The Phius Certification project contract date determines the required program version. Generally, projects can voluntary choose to comply with a newer version than required by contract date.

This calculator can be used to determine psi-values for 2-D thermal bridges in combination with THERM.

The window comfort and condensation risk criteria apply to all buildings, regardless of size. Use this tool to determine the maximum U-values allowed and demonstrate compliance. New features: Unit conversion (imperial and metric), multiple languages (English, French, Japanese and Spanish) and custom climate data is accepted.