Temperature Switches: Function, Installation Tips & Best Practices

In the world of Relays and Switches, temperature switches are an unsung hero of HVAC, plumbing, and electrical systems. A well-selected temperature switch can mean the difference between efficient, safe operation and costly downtime. 

In this guide, we’ll explore how temperature switches work, key installation considerations, and expert-level tips to ensure optimal performance. Along the way, we’ll highlight some standout models available from Voomi Supply that have proven reliability in demanding real-world applications.

How Temperature Switches Work

A temperature switch is a control device that reacts to changes in temperature by opening or closing an electrical circuit. When a pre-set temperature threshold is reached a maximum or minimum limit. The switch activates to protect equipment, regulate system performance, or trigger alarms.

They are used extensively in HVAC systems, refrigeration units, industrial machinery, and even specialized pumping equipment. Beyond simple temperature control, modern temperature switches integrate safety features that help prevent overheating, freezing, or pressure-related failures.

Benefits of Using Temperature Switches

1. Equipment Protection – Prevents damage by shutting down systems operating outside safe temperature or pressure ranges.

2. Energy Efficiency – Reduces unnecessary run-time, lowering utility costs.

3. Process Reliability – Ensures consistent operation, vital in manufacturing and environmental control.

4. Safety – Prevents overheating or pressure build-up that could cause hazardous conditions.

Installation Best Practices for Temperature Switches

A temperature switch’s accuracy and lifespan depend on correct installation. Here are the core considerations:

• Correct Sensor Placement – Position the sensing element where it will measure actual system conditions, not ambient influences.

• Secure Electrical Connections – Loose terminals cause erratic performance and can lead to premature failure.

• Follow Manufacturer Specifications – Each model has unique mounting and wiring requirements.

• Accessibility for Maintenance – Install in a location where adjustments or replacements can be made without dismantling major components.

Regular inspection, calibration (if applicable), and cleaning ensure optimal operation over the long term.

Real-World Examples of Quality Temperature Switches

Voomi Supply offers several temperature and pressure switches designed for professional use. Below are top-performing models worth considering for different applications.

1. Lennox 86M36 High Pressure Switch

• Purpose: Protects HVAC systems by monitoring and controlling pressure within safe limits.

• Key Features:

• Durable build for longevity in the field.

• Easy to install and service.

• Compatible with various Lennox models.

• Best Use Case: HVAC technicians needing a quick, reliable replacement for high-pressure monitoring.

2. Pentair 51752-100-7 Hydromatic Pressure Switch

• Purpose: Ensures efficient operation of SHEF30 submersible sump and effluent pumps.

• Key Features:

• Built for reliability in drainage environments.

• Designed specifically for Hydromatic series pumps.

• Straightforward installation process.

• Best Use Case: Water management systems in basements, wastewater facilities, and flood prevention setups.

3. Lennox 65W67 Adjustable High Pressure Switch

• Purpose: Maintains critical pressure in HVAC systems with adjustable settings.

• Key Features:

• Adjustable range: 300-450 psi.

• Manual reset for safety and easy maintenance.

• Works with R-22, R-134a, and R-410A refrigerants.

• Best Use Case: Commercial or industrial HVAC systems requiring versatile refrigerant compatibility.

4. White-Rodgers 90-380 Heavy Duty Fan Switching Relay

• Purpose: Controls fans in heating and cooling systems.

• Key Features:

• Quiet, economical performance.

• Compact, totally enclosed design for durability.

• Suitable for general switching tasks beyond fans.

• Best Use Case: Multi-purpose HVAC control, especially where reliability in various positions is required.

5. Goodman 20197308 Air Pressure Switch

• Purpose: Monitors and controls airflow in Goodman and Amana gas furnaces.

• Key Features:

• Operating pressure of -0.1 inches WC.

• Compact design for easy replacement.

• Ensures safe, efficient furnace operation.

• Best Use Case: Gas furnaces in residential or commercial heating systems needing accurate airflow monitoring.

Tips for Selecting the Right Temperature Switch

When choosing a temperature switch for your application, consider:

1. Temperature & Pressure Range – Match the switch’s range to your system’s operating conditions.

2. Environmental Conditions – Select materials and enclosures suitable for moisture, dust, or vibration.

3. Reset Type – Manual vs. automatic reset can impact maintenance procedures.

4. Compatibility – Ensure fit with existing system wiring, mounting, and voltage.

Maintenance and Longevity

Routine checks are key:

• Inspect Wiring: Look for corrosion or loose terminals.

• Test Function: Confirm switching occurs at the correct threshold.

• Clean Contacts: Remove dust or oxidation to prevent false readings.

These steps can dramatically extend the life of your switch and keep your systems running smoothly.

Keeping Systems Reliable with the Right Switch

In this guide, we’ve covered the role, installation best practices, and professional tips for temperature switches, along with real-world product examples suited for HVAC, pump, and electrical systems.

From the Lennox 86M36 for safe HVAC pressure control to the Pentair 51752-100-7 for precise sump pump operation, each unit in Voomi Supply’s selection is backed by industry expertise and a commitment to quick delivery. Selecting the right temperature switch and installing it correctly is one of the most cost-effective ways to boost efficiency, protect equipment, and ensure safety.

For professionals and advanced DIYers looking to keep their systems dependable, Voomi Supply offers a curated range of Relays and Switches, pressure switches, and control components to meet the highest standards.