Controller, Definition
Sierra Heating and Air Conditioning - Serving Chico, Paradise and Yuba City
Wikipedia article: Controller (control theory)
A device that controls the operation of part or all of a system. It may simply turn a device on and off, or it may more subtly modulate the set point of components. Most controllers are automatic but have user input such as temperature set points, e.g. a thermostat. Controls may be analog or digital.
About Sierra Heating and Air Conditioning
- Your Heating and Cooling Professional
- Professional Installers
- 24-Hour Emergency Response
- Complete Installations and Retrofits
- Experienced HVAC Professionals Dedicated to Quality
- Professional Consultants – Timely Estimates
- Service After the Sale

It has been our pleasure to serve this community since 1972. Since the very beginning our team of professionals have dedicated themselves to being knowledgeable about heating and air conditioning products, to bring you quality installation and courteous, friendly service after the sale.
We are committed to meeting your comfort equipment needs and to keep your system running reliably and efficiently for years and years. With professional technicians we are your first choice to meet your indoor comfort needs. We know that having the right people on the job is just as important as choosing the best equipment. Our trained professionals provide you with top quality equipment, skilled installation and an expert analysis of your comfort needs. Our recommendations will fit your budget and lifestyle needs.






