Buying a Lennox S40: What to Know
FAQ , Thermostats , Other Modified: April 22, 2026
Important Notice: Purchase Lennox S40 Smart Thermostats from Authorized Sellers Only
At Lennox, your comfort and confidence in your home’s technology matter to us. We’re sharing this notice to help you avoid potential issues when purchasing smart thermostats online.
Lennox has identified stolen S40 Smart Thermostats that are being offered for sale through unauthorized sellers, including some third-party e-commerce platforms. While these listings may appear legitimate or priced below market value, products sold outside authorized Lennox channels may not be supported.
Every Lennox S40 Smart Thermostat is uniquely identified. If a thermostat is confirmed to be stolen or sold through an unauthorized source:
Warranty coverage may not apply
Smart features and app connectivity may be restricted or unavailable
The thermostat may be disabled
To ensure full support, warranty protection, and reliable smart performance, purchase Lennox products only from a Lennox dealer.
If a deal seems unusually inexpensive or a seller cannot clearly verify authorization, we recommend pausing before purchasing.
Lennox stands behind every properly sourced product we sell. Purchasing through authorized channels ensures full warranty protection, reliable app connectivity and updates, and long-term performance and support.
If you have questions if you’re concerned about a recent purchase, please contact your local Lennox Dealer or Lennox Customer Support for guidance.
Thank you for choosing Lennox.
Why is Lennox sharing this notice?
Lennox has identified stolen S40 Smart Thermostats that are being sold through unauthorized sellers, including some third-party online marketplaces. This information is shared to help homeowners avoid purchasing products that may not be supported.
How can I tell if I purchased from an authorized Lennox seller?
If you’re unsure, your local Lennox Dealer or Lennox Customer Support can help confirm.
What happens if my S40 was purchased from an unauthorized seller?
Thermostats purchased from unauthorized sellers may not be eligible for warranty coverage, technical support, or full smart functionality. Connectivity may be limited or the device may be disabled.
Can a stolen or unauthorized S40 still work?
It may appear to work initially, but functionality is not guaranteed. Smart features or app connectivity may be restricted.
Will Lennox provide warranty or technical support for these thermostats?
Lennox may not provide warranty service, replacements, or technical support for stolen or unauthorized products.
What should I do if my thermostat is already installed?
If you’re concerned about where your thermostat was purchased, contact your local Lennox Dealer or Lennox Customer Support for guidance. They can help review your situation and discuss next steps.
Why are some S40 thermostats sold at much lower prices online?
Prices that are significantly below normal market value are often a warning sign. These listings may involve stolen, previously used, or unauthorized products.
How can I protect myself when buying Lennox products?
To ensure full support and peace of mind, always purchase Lennox products from authorized sellers. If a deal seems unusually low or unclear, it’s best to verify before buying.
Who should I contact if I have questions or concerns?
Please contact your local Lennox Dealer or Lennox Customer Support. They can help answer questions and confirm whether a product was purchased through an authorized channel.
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