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Service & Maintenance

Environmental Systems provides a unique range of mechanical services with a seasoned team of highly trained  technicians. We offer service plans ranging from quarterly basic maintenance to energy monitoring. Our coverage spans all of Northern and Central California.  We provide on-call emergency service 365 days a year.

 We Offer the Following Services:

  • Equipment Service

  • Preventive Maintenance

  • Retrofits and Upgrades

  • Hydronic Service

  • EMS Hardware Support

  • 24/7 Service


ESI’s highly skilled and tenured service technicians provide unparalleled knowledge and continuity to our customers. We have the ability to get to your facility quickly. ESI will develop a flexible Preventive Maintenance program that specifically meets your needs. We offer emergency service and preventive maintenance on HVAC systems of all types. Service contracts are available for maximum security.

24/7 Emergency Service: ESI is available for emergency service and can provide all labor, travel, parts, and materials – twenty-four hours a day, seven days a week.

HVAC and Refrigeration

By providing our clients with preventive care of their systems, ESI can help ensure better operation and longer equipment life. With many clients running round the clock operations, we know the importance of 24 hour response time.

Our union educated technicians are all certified in accordance with the latest occupational and environmental regulations. On-going union and factory certifications are requirements. As an additional benefit to our clients we can provide in house training, and supplement in house technical support on a temporary basis.


With a 24/7 Response Tech Team Providing Expert Service:

  • Heating, Air Conditioning, and Refrigeration

  • Cooling Tower Service and Water Treatment

  • Centrifugal and Reciprocating Chiller Service

  • Hot Water Systems and Boilers

  • Multi-zoned and Built-up Systems

  • Variable Frequency Drives Installation and Service

Environmental Chambers


Environmental chambers are an integral part of the high tech R&D of Silicon Valley. As a company, ESI occupies a unique position in the environmental testing industry. As one of only a handful of Silicon Valley environmental chamber service companies, our services are in high demand. Additionally, we are the only local company whose chamber division consists solely of technicians trained by manufacturers. Knowing how vital product development and testing are to our clients, this gives  us a technical edge.  ESI provides service, repairs, and calibrations ranging from cascade systems, to shock and altitude chambers, and vibration tables.

We offer the following Environmental Chamber Services:

  • Start-ups

  • Upgrades

  • Custom Builds

  • Calibrations

  • Programming

  • Preventive Maintenance

  • 24/ Response

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