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.

What mechanisms is the S40 using to clean the air inside my home?

Filtration - at minimum, the S40 Smart Thermostat will run the blower to circulate the air through the filter. We recommend you install a high-efficiency filter such as our Carbon Clean 16®.

Purification - if you have a PureAir S air purification system installed, the S40 Smart Thermostat will run the PureAir S when you need it.

Ventilation - if you have a Healthy Climate HRV or ERV installed, The S40 will run the ventilation system on demand.

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