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Choosing the Right Thermostat: Honeywell TC500 vs TC300

Smart Commercial Thermostats: TC500 vs TC300

When it comes to smart, connected thermostats in commercial HVAC applications, Honeywell’s TC series offers powerful options — especially the TC500 and the TC300. Both thermostats deliver energy savings and easy integration into building automation systems, but they serve slightly different needs.

Let’s break down their key features and differences to help you choose the right fit for your project.

Feature Comparison

Feature TC500 TC300
Display 4.3” Touchscreen 2.36” Color LCD
Connectivity Wi-Fi, Bluetooth, BACnet/IP, Modbus TCP/IP BACnet MS/TP
Configuration Mobile App or On-Screen On-Screen
Scheduling 7-Day Programmable 7-Day Programmable
Compatible Systems Rooftop Units, Heat Pumps, Fan Coils Rooftop Units, Heat Pumps, Fan Coils
Inputs/Outputs 6/4 Configurable I/Os 4/4 Configurable I/Os
Cloud Integration Yes (via Honeywell Building Manager) No
Commissioning Tool TC500 Mobile App Local interface only
Ideal For Connected Smart Buildings Smaller or standalone HVAC systems

Key Advantages of the TC500

  • Cloud Connectivity: Designed for connected buildings with BACnet/IP, Modbus TCP/IP, Wi-Fi, and Bluetooth for remote access and control.
  • Mobile-Friendly Commissioning: Quick setup using the Honeywell TC500 mobile app, ideal for contractors managing multiple devices.
  • Sleek, Modern Interface: A 4.3” touchscreen that’s visually appealing and user-friendly.
  • Data Logging & Alarming: Trend logs and real-time alarming support proactive maintenance.

Key Advantages of the TC300

  • Cost-Effective Control: Reliable control without cloud connectivity or advanced commissioning tools.
  • Simplified Setup: All configuration is done locally through the screen.
  • BACnet MS/TP Compatibility: Ideal for integration with smaller commercial building systems.

Which Should You Choose?

Choose the TC500 if you need:

  • Integration with cloud systems and modern building automation platforms
  • A mobile-friendly, app-based setup
  • Remote monitoring, logging, and alarming features
  • A premium, sleek interface for occupants

Choose the TC300 if you need:

  • Reliable, standalone thermostat control with a lower cost
  • Simple BACnet MS/TP integration
  • Local-only configuration and no reliance on cloud or mobile tools

Final Thoughts

Both the TC500 and TC300 provide high-quality control for commercial HVAC systems — the difference comes down to connectivity and commissioning preferences. If you're designing a smart, future-ready facility, the TC500’s cloud features and mobile access shine. For smaller buildings or straightforward projects, the TC300 offers a solid, cost-efficient alternative.

Need help deciding? Reach out to us at bas@stromquist.com

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