HVAC Controls

Precision Control for Every HVAC Application

From simple thermostat replacements to multi-zone control systems, we stock the controls HVAC professionals need. OEM-quality parts, competitive pricing, and fast fulfillment on all orders.

What is the difference between a programmable and a smart thermostat?

A programmable thermostat allows you to set temperature schedules in advance for different times of day and days of the week, but must be configured manually at the device. A smart thermostat adds Wi-Fi connectivity, enabling remote control via a smartphone app, learning algorithms that adapt to your schedule, and integration with home automation systems such as Amazon Alexa or Google Home.

What is an HVAC contactor and when does it need to be replaced?

An HVAC contactor is an electrical switch that controls the flow of power to the compressor and condenser fan motor in an air conditioning system. Contactors typically last 5-10 years but can fail sooner due to electrical arcing, pitting, or insect damage. Signs of a failing contactor include the AC unit not starting, humming without cooling, or visible burn marks on the contactor points.

What is a zone board and how does it improve HVAC efficiency?

A zone board is a control panel that manages multiple dampers and thermostats in a zoned HVAC system, allowing different areas of a building to be heated or cooled independently. Zoning reduces energy waste by conditioning only occupied spaces, can extend equipment life by reducing runtime, and improves occupant comfort by eliminating hot and cold spots throughout the building.

Are White-Rodgers thermostats compatible with heat pump systems?

Yes, many White-Rodgers thermostats are specifically designed for heat pump compatibility and include dedicated heat pump wiring configurations (O/B reversing valve terminal, auxiliary heat staging, and emergency heat mode). Always verify the thermostat wiring compatibility with your specific heat pump model before purchase, particularly for multi-stage and variable-speed systems.

What is a snap disc control and where is it used in HVAC systems?

A snap disc control (also called a thermal limit switch) is a temperature-activated safety device that opens or closes a circuit at a preset temperature. In HVAC applications, snap disc controls are used as high-limit switches on furnaces and heat pumps to prevent overheating, as fan controls to start and stop blower motors at specific temperatures, and as freeze protection devices on refrigeration equipment.