A temperature sensor is a device that detects and measures ambient air temperature, sending this information to the HVAC control system to regulate heating and cooling equipment. These sensors use various technologies, including thermistors and resistance temperature detectors (RTDs), to convert temperature changes into electrical signals. Accurate temperature sensing is essential for maintaining comfort and optimizing energy efficiency.
Sensor Types and Accuracy
Thermistor-based sensors offer accuracy within 1 to 2 degrees Fahrenheit and cost between 10 to 50 dollars, making them common in residential systems. RTD sensors provide higher precision within 0.5 degrees Fahrenheit but cost 50 to 150 dollars. Digital sensors with integrated signal conditioning provide the most reliable readings for modern smart systems.
Installation Locations
Temperature sensors are typically mounted in return air ducts, supply ducts, or wall-mounted thermostats where they experience representative indoor conditions. Proper placement away from direct sunlight, heating sources, and air drafts ensures accurate readings. Multiple sensors in zone-based systems allow independent temperature monitoring in different building areas.