Vernon Marshall explains the role of low voltage wiring in HVAC systems, including thermostat wire colors, 24-volt controls, and how to use a multimeter to check for broken wires. This demonstration was part of the September–October 2026 HVAC Technical Academy workshop in Sanford, Florida.
Today Andrew reviewed wiring… an important element in all HVAC systems. To break it down: HVAC low-voltage wiring typically operates on a 24-volt circuit supplied by a step-down transformer inside the furnace or air handler. It acts as the control system—or “messenger”—telling high-voltage relays when to turn the compressor, blower motor, or heating elements on and off.
Learn by doing… that’s what you will expect and will receive at HVAC Technical Academy… located in Sanford, Florida, reach out and learn…