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Why Dealer Support Matters in HVAC — And How ComfortStar Delivers

In today’s HVAC landscape, choosing the right product is only half the equation. The other half? Support. Whether you’re an installer, contractor, or business owner, having a reliable partner behind the system you install can make all the difference—not just at the time of sale, but for years down the road.

At ComfortStar, we understand that the best equipment is only as good as the team that stands behind it. That’s why our commitment goes beyond offering high-efficiency, energy-conscious HVAC solutions—we back every unit with world-class technical support, a robust warranty, and an unwavering focus on quality.

🔧 Built for Performance. Backed for Peace of Mind.

ComfortStar systems are engineered to deliver dependable performance across residential and light commercial applications. But we know that in the field, things happen. Installers may have questions. Technicians need real-time troubleshooting. That’s why our U.S.-based technical support team is always ready to help. From pre-installation inquiries to post-sale support, we ensure our partners never feel left in the dark.

🛡️ A Warranty That Works for You

We believe confidence is key—and we back that belief with one of the most competitive warranties in the business. Our coverage reflects our trust in the products we build, and more importantly, gives peace of mind to those who install and rely on them every day.

📈 A Partner in Your Growth

When HVAC professionals choose ComfortStar, they’re not just buying equipment—they’re partnering with a company that’s invested in their success. From easy-to-access documentation to product training and dealer resources, we’re here to support your growth, one installation at a time.


As the HVAC industry continues to evolve, support is no longer a “nice to have”—it’s a necessity. At ComfortStar, we’re proud to be more than a manufacturer. We’re your partner in the field, your resource for answers, and your advocate for success.

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ComfortStar Technical Bulletin 24V+485 AHU Wiring Connecting Guide – Scenario 1 (Recommend)

24V+485 AHU Wiring Connection Guide - Technical Bulletin No. TB230427-03
Scenario 1 (Recommended)

Learn how to correctly connect the AHU-SG2 Air Handler to a CPR or CPH Side Discharge Condensing Unit with the ComfortStar thermostat in Scenario 1 of the 24V+485 AHU Wiring Connection Guide (Technical Bulletin No. TB230427-03).

You can access this bulletin by clicking here or through the ComfortStar Tech Support Mobile App in the APP STORE or GOOGLE PLAY under technical bulletins.

  • In Scenario #1, connect the thermostat to HA and HB on the display board and the condenser cables to S1 and S2 on the main board of the AHU-SG2.
  • For the CPR or CPH Side Discharge Condensing Unit, attach S1 and S2 on the top terminal board, clearly marked.
  • Ensure all DIP switches are in the off position (switched to the bottom).
  • When the unit is powered on, the board should display 00.
  • Once the thermostat is activated, your settings will appear on the AHU-SG2 display board, and in Scenario 1, the blower motor will start running within seconds.
  • In this setup, the blower motor will run continuously even after the desired temperature is reached; only by physically turning off the thermostat can you stop the blower motor.

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