What is ASHRAE Standard 90.1?

ASHRAE 90.1 is the Energy Standard for Sites and Buildings Except Low-Rise Residential Buildings.

Energy efficiency standards impact all HVAC systems, including DOAS units. The notable energy standard to follow for commercial applications is ASHRAE 90.1. 

ASHRAE 90.1 sets the energy standard for commercial building applications. United States building codes use this as their benchmark when setting their codes regarding energy efficiency. Even other countries have turned to this standard when looking for energy efficiency requirements in their codes.