Which Switch is Best for You?

Senasys manufacturers a large variety of temperature switches for HVAC systems, including our TC Switch (Firestat), bulb and capillary thermostat, bi-metal switches and micro snap action switches.

Temperature HVAC Switches

Senasys manufactures a wide array of temperature switches for HVAC systems including bulb and capillary thermostats, bi-metal snap disc thermostats, and duct limit switches.The temperature switches for HVAC systems typically are used as a fan or lime when a pre-defined temperature is reached.

Bulb and Capillary Thermostats

Bulb and Capillary thermostats are commonly used as a limit of control in HVAC equipment.

Senasys supplies a variety of bulb and capillary thermostats including adjustable temperatures or fixed.

For more information, visit the product page. 

351-254327 Capillary Thermostat | Stemco by Senasys

Duct Limit Switches

Our TC Adjustable Limit Switches, also known as a Firestat, are used to shut down heating, ventilation and air conditioning equipment. They are shut down once the air temperature rise exceeds the units pre-set limit.

Senasys is current in the research and development stage for a duct fan switch, which will turn on equipment when the temperature exceeds the limit in the HVAC equipment, such as a fan of a blower.

For more information, visit the product page.

Firestat Duct Control


Bi-Metal Snap Disc Thermostats

Quality-engineered thermal sensors specifically designed for a variety of major appliances, including room unit and space heaters, air conditioning systems and wood stoves.

Senasys bi-metal snap disc thermostat switches are available in four different options, automatic reset, hermetically epoxy sealed, manual reset or single shot.

For more information, visit the product page.

snap disc thermostat switches


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Bulb & Capillary Thermostats

Original equipment manufacturers worldwide use thermostat switches designed and manufactured by STEMCO, a Division of Senasys. No matter which style or model you choose, all of the capillary thermostat switches operate using the same physics. A fluid is encapsulated in a metal and when the temperature changes the fluid either expands or contracts. This fluid change moves a diaphragm which is in touch with a snap action switch and either opens or closes a circuit.

Ambient Compensation

Our capillary thermostats can be ambient compensated to offset the differential in temperature which keeps our thermostat controls more accurate as it’s environment changes.

Custom Options

Capillary thermostat switches built by Senasys can also be built to customer specifications. This insures you get the exact control you want without paying for features you don’t need.