Why choose emcor services arizona? EMCOR Services Arizona provides customers statewide with customized, cost-effective, energy-efficient solutions. Learn about us. Learn about our capabilities and expertise. EMCOR Services Arizona offers fully integrated, single-source solutions ranging from engineering applications and automated control systems to turnkey in-house capabilities.Who is mesa energy systems? For over 35 years, Mesa Energy Systems, Inc. (dba EMCOR Services Mesa Energy) has provided its clients with high quality mechanical, commercial HVAC, and building automation consulting and services that address today's most compelling energy related issues.Who is emcor group inc? EMCOR Group Inc. :: Our Locations We're the 33,000+ highly skilled professionals working at over 80 companies in 170 locations. Our size and market proximity give us a dynamic combination that makes us the leading provider of mechanical and electrical construction, industrial and energy infrastructure, and building services.