The short version: The Lennox iComfort S30 Ultra has been discontinued by Lennox and officially replaced by the iComfort S40 Ultra. If a dealer is quoting you an “S30,” confirm whether they actually mean the current S40 — Lennox’s own support documentation treats this as a direct replacement. What follows covers what the S30 offered and what changed.

A note on sourcing: This is a dealer-installed, contractor-channel product. Independent owner reviews are scarce, and what exists mostly covers the now-superseded S30. Ask your installer for recent customer references, and confirm which model — S30 or S40 — you’re actually being quoted.

Who It’s For

The S30 (and its S40 successor) is Lennox’s premium “communicating” thermostat, designed to work as a home-automation hub for Lennox HVAC equipment with compatible communicating components. It’s built for forced-air homes running Lennox systems, where it can manage staging, humidity, and zoning in ways a basic thermostat can’t. On non-Lennox or non-communicating equipment, most of its advanced features aren’t available.

Design & Build and Compatibility

The S30 used a 7-inch HD color touchscreen with a tablet-like interface and required a separate wireless Smart Hub Controller for internet connectivity. Its successor, the S40 Ultra, keeps the 7-inch display but eliminates the separate hub requirement, according to Lennox’s own product documentation — a meaningful setup simplification if you’re comparing the two.

Full functionality on either model depends on Lennox “communicating” system components, which typically requires installation by a Lennox-certified technician, including a second communication part installed at the outdoor unit or air handler per installer accounts we found. This isn’t a plug-and-play retail thermostat.

Price & Value

Lennox iComfort S30 Ultra (discontinued)
Price (USD) $330–$480 (installed pricing varies by dealer; figure reflects last known S30 pricing)
Where sold Lennox dealer network
Subscription required No

Given the discontinuation, expect any current quote to reference the S40 Ultra rather than genuinely new S30 stock. Confirm pricing against the current model before comparing quotes.

Pros & Cons

Pros:
– Deep integration with Lennox communicating equipment (staging, humidity, zoning)
– Large, tablet-style touchscreen
– Professional installation included as part of the typical purchase path

Cons:
– Discontinued — current buyers are almost certainly being sold the S40 Ultra instead
– Full feature set requires Lennox communicating components, not just any furnace/AC
– Requires certified-installer setup, no retail DIY path
– Very limited independent review coverage

Frequently Asked Questions

Is the Lennox iComfort S30 Ultra still sold?
No. Lennox has discontinued it and replaced it with the iComfort S40 Ultra. If you’re getting a quote referencing the S30, confirm with your dealer which model is actually being installed.

What’s different about the S40 that replaced it?
Per Lennox’s own documentation, the S40 keeps the 7-inch touchscreen but removes the need for a separate wireless Smart Hub Controller, simplifying installation.

Does the iComfort S30/S40 work with non-Lennox HVAC equipment?
Basic thermostat functions work, but the advanced “communicating” features that justify the premium price require Lennox-compatible communicating system components.