FREQUENTLY ASKED QUESTIONS

Perfect comfort is something we want you to experience long after you’ve purchased your Lennox® product. That’s why we offer a collection of resources that make it as easy as possible for you to get the answers and support you need.

ComfortSense® 5500 & 3000 FAQ – Now Replaced by L40

What happened to the ComfortSense® 5500 Thermostat?

The ComfortSense® 5500 Thermostat has been discontinued and is now replaced by the advanced Lennox® L40 Thermostat. The L40 offers a modern interface, enhanced smart features, and seamless integration with Lennox systems.

Is the ComfortSense® 3000 Thermostat still available?

No. The ComfortSense® 3000 has been discontinued. For those seeking a modern, smart alternative, Lennox recommends the L40 Thermostat, which brings updated design, connectivity, and energy-efficient control features.

What improvements does the Lennox® L40 Thermostat offer over the ComfortSense® 5500 and 3000 models?

The Lennox® L40 Thermostat delivers a modern upgrade to both the ComfortSense® 5500 and 3000 models, combining smart functionality, convenience, and energy efficiency. Key improvements include:

    • A sleek, intuitive touchscreen interface
    • Built-in Wi-Fi connectivity with mobile app control
    • Smart home integration with enhanced automation
    • Flexible scheduling options and energy-saving features

These upgrades make the L40 an ideal replacement, bringing legacy models in line with today's homeowner expectations. Explore the full feature set on the L40 Thermostat product page.

Where can I find manuals or support documents for the ComfortSense 5500?

You can still download key documents for legacy support:

These are useful for maintenance, troubleshooting, or reference.

Where can I find support documents for the ComfortSense 3000?

Key documentation is still available for existing ComfortSense 3000 owners:

These can help with basic operation or uninstall references.

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