Products for the HVAC Professional

Greystone Energy Systems Inc. is one of North America’s largest ISO registered manufacturers of HVAC sensors and transmitters for Building Automation Management Systems.

We have conscientiously established a worldwide reputation as an industry leader by maintaining leading-edge design technology, prompt technical support, and a commitment to on-time deliveries. We take pride in our Quality Management System which is ISO 9001 certified, assuring our customers of consistent product reliability.

Greystone’s growing again

Click the picture below to see the construction progress of Greystone’s latest expansion


CMD Series

Carbon Monoxide Monitor

with Analog or BACnet/Modbus

CMD5B1 Series

Carbon Monoxide Monitor

NDD Series

Nitrogen Dioxide Detector