GoVets offers HVAC Controls and Thermostats in the HVAC and Refrigeration category to help customers complete their projects. Sequencers are products used to control the sequence of operations in HVAC systems. They are used to control the sequence of operations in HVAC systems, such as turning on and off the fan, compressor, and other components. Shop today to find the right HVAC Controls and Thermostats for your project.