Software Design

IoT Smart Thermostat HVAC Control States

State Diagrams · made in Skemio

State machine for IoT HVAC system: Idle, Cooling, Heating, Fan Only, and Eco Hold with deadband triggers.
State machine for IoT HVAC system: Idle, Cooling, Heating, Fan Only, and Eco Hold with deadband triggers.
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What it shows

  • Short-cycle protection guards compressors against physical motor burnout.
  • Deadband thresholds (e.g., +/- 1.5°F) prevent constant on/off cycling.
  • Eco-hold states override user presets during peak grid energy pricing.

The takeaway

Smart HVAC states enforce deadbands and compressor delays to cut bills and save hardware.

More state diagrams