Indoor Environmental Services (IES) is a Mechanical Contractor offering HVAC Maintenance, Service, and Facility Solutions to Commercial and Industrial customers throughout the Northern California region. IES has offices in Sacramento, Santa Rosa and Pleasanton, with a national presence as a Service Logic company. Our services include - Preventive Maintenance, Service and Repair, Engineering, Controls, Water Treatment, Sheet Metal Fabrication, Piping, Industrial Refrigeration, and Indoor Air Quality, as well as Tenant Improvements, Design Build and General Contractor Construction.