Computer Room Air Conditioners


Technology options for improving the efficiency of water-source heat pumps include higher-efficiency compressors and fan motors.


The 2010 version of ASHRAE 90.1, which is a commercial building energy code, established a new equipment class for “air conditioners and condensing units serving computer rooms.” This action triggered DOE to set standards for CRACs. In 2012, DOE adopted the ASHRAE 90.1 efficiency levels as national standards, and they took effect in 2012 or 2013, depending on the specific type of equipment. 

The standards for CRACs are based on a metric called sensible coefficient of performance (SCOP), which is the net sensible cooling capacity (in kW) divided by the power input (in kW).


Technology options for improving the efficiency of CRACs include higher-efficiency compressors, fan motors, and expansion valves and improved heat exchangers. 


Federal Date States
Potential Effective Date of Updated Standard 2021
Updated DOE Standard Due 2018
1st Federal Standard Effective 2013
1st Federal Standard Adopted (DOE) 2012
Test Procedure - Last Revised - Active Mode 2012

Timeline reflects state standards from 2001 to present; federal standards from inception to present.