Onsite’s air‐side optimization projects save energy and reduce cost of operation. We have been implementing these projects since 2015. They have achieved 15%‐20% overall facility energy reductions, and 35%‐40% reductions in energy used for cooling. These projects focus on the air‐side of the CO’s Telecommunications Equipment (TE) Process Cooling System (PCS). Projects are comprehensive and address the PCS in a holistic manner. This approach is superior to piecemeal projects because the interdependencies between the components of the PCS require that all components are working properly to ensure that the system as a whole is working in an optimized manner.