# Lennox Smart Tech — Mobile Service & Installation > Mobile app for installing and servicing Lennox Smart Thermostats. (iPhone/iPad app by Lennox Industries.) - Source: https://appshunter.io/ios/app/lennox-smart-tech/id6443907644 (this page in markdown: same URL + `.md`) - Developer: [Lennox Industries](https://appshunter.io/developer/355049651) - Category: Utilities, Lifestyle - Price: Free - Rating: 4.50/5 from 60 App Store ratings · 4 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 98 MB - Languages: American English - Released: 2022-11-08 - Data updated: 2026-08-15 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/lennox-smart-tech/id6443907644/reviews.md ## What is Lennox Smart Tech? With the Lennox Smart Tech App, you'll have the latest technology to more quickly and easily install and service a fully communicating home comfort system with the Lennox S40/L40/M40/E40 Smart Thermostat. You can reliably run tests, diagnostics, and change system settings directly from your smartphone without the back and forth from equipment to thermostat. ## Key features - Install and service home comfort systems - Test and run diagnostics remotely - Adjust system settings from smartphone - Compatible with Lennox S40/L40/M40/E40 Smart Thermostats - Direct smartphone control ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/lennox-smart-tech/id6443907644/reviews.md ### 1/5 — S40 won’t connect to WiFi *2026-05-05* Refuses to connect to BT or WiFi. Horrible. ### 1/5 — So many connection issues *2026-03-14* Brand new S40. Doesn’t connect. Either blue tooth or Wi-Fi. See thermostat. Connecting lasts for 8min but never connects. Same issue on the S30 thermostats. Not friendly at all I have found I save a lot of time just setting up thermostats manually. Luckily I haven’t had remote sensors yet otherwise I would be screwed. ### 1/5 — Worst app I’ve ever used *2026-02-11* I wouldn’t wish this app on my worst enemy ### 1/5 — Will not connect to iPhone 14 Pro Max! *2023-11-12* Cannot use this app! It will not connect to the thermostat. The other techs running iOS and even android operating systems will connect, but there seems to be a problem connecting with 14 pro max. I had to download the app on the customers android just to connect to the thermostat. Please fix the connectivity issues iPhone 14 Pro Max iOS 17.1.1 ## Frequently asked questions about Lennox Smart Tech ### What is Lennox Smart Tech used for? Lennox Smart Tech is a mobile application designed to help technicians install and service compatible Lennox home comfort systems, specifically the S40/L40/M40/E40 Smart Thermostats. It allows for remote testing, diagnostics, and system setting adjustments. ### Is Lennox Smart Tech free to download? Yes, Lennox Smart Tech is available for free download. It does not have any associated costs for acquisition or use. ### What devices support Lennox Smart Tech? Lennox Smart Tech is supported on iPhone, iPad, and iPod devices. It is designed for mobile use by technicians in the field. ### How often is Lennox Smart Tech updated? The latest version of Lennox Smart Tech is 4.60.103, last updated on March 27, 2026. This indicates a commitment to regular updates and improvements for the application. ### What is the age rating for Lennox Smart Tech? Lennox Smart Tech has an age rating of 4+. This suggests it is suitable for a broad audience, though its primary users are professional technicians. ### Does Lennox Smart Tech have ads? No, Lennox Smart Tech does not contain advertisements. Users can expect an uninterrupted experience while using the app for service and installation tasks. ### What specific Lennox thermostats are compatible with Lennox Smart Tech? Lennox Smart Tech is designed to work with fully communicating home comfort systems featuring the Lennox S40, L40, M40, and E40 Smart Thermostats. ### Can Lennox Smart Tech be used offline? The provided information does not specify offline functionality. However, given its nature for remote diagnostics and adjustments, an active internet connection is likely required for full operation. ## Version history (last 5 releases) ### 4.60.103 — 2026-03-27 • Added support for the new E40 Thermostat • Bug fixes and performance improvements for a smoother experience ### 4.40.103 — 2026-03-06 This release introduces support for the Lennox M40 Thermostat and provides bug fixes and other improvements. ### 4.33.081 — 2025-04-08 Updated App name to Lennox Smart Tech. ### 4.33.080 — 2025-02-03 * Added support for L40 thermostat along with S40 thermostats. * Bug fixes and Improvements. ### 4.31.515 — 2024-12-18 We’ve added updates to enhance performance, reliability, and compatibility with the latest HVAC systems. Enjoy seamless comfort and peace of mind knowing your system is always up to date. ## Apps similar to Lennox Smart Tech | App | Rating | Price | Category | | --- | --- | --- | --- | | [Rheem](https://appshunter.io/ios/app/rheem/id1604626837) | 4.6 (1,543) | Free | Utilities | | [Bluon HVAC](https://appshunter.io/ios/app/bluon-hvac/id1357521880) | 4.8 (4,450) | Free | Utilities | | [ServiceTitan Mobile](https://appshunter.io/ios/app/servicetitan-mobile/id1037989976) | 3.0 (1,608) | Free | Utilities | | [Carrier® Service Technician](https://appshunter.io/ios/app/carrier-service-technician/id1123086541) | 4.1 (108) | Free | Utilities | | [Bryant® Service Technician](https://appshunter.io/ios/app/bryant-service-technician/id1123183471) | 2.4 (38) | Free | Utilities | | [Ruud](https://appshunter.io/ios/app/ruud/id1608918835) | 4.6 (990) | Free | Utilities | ## More apps by Lennox Industries - [Lennox](https://appshunter.io/ios/app/lennox/id355049647) - [Lennox iComfort Wi-Fi](https://appshunter.io/ios/app/lennox-icomfort-wi-fi/id527608198) - [Lennox Prodigy](https://appshunter.io/ios/app/lennox-prodigy/id802832431) - [LennoxPros](https://appshunter.io/ios/app/lennoxpros/id870321742) - [VRF & Mini-Splits](https://appshunter.io/ios/app/vrf-and-mini-splits/id916090359) - [iComfort Dealer Setup](https://appshunter.io/ios/app/icomfort-dealer-setup/id1027083656) All apps by Lennox Industries: https://appshunter.io/developer/355049651 ## Related topics [lennox smart tech](https://appshunter.io/ios/topics/lennox-smart-tech) · [lennox smart technician](https://appshunter.io/ios/topics/lennox-smart-technician) · [lennox pros](https://appshunter.io/ios/topics/lennox-pros) · [lennox s40 smart thermostat](https://appshunter.io/ios/topics/lennox-s40-smart-thermostat) · [lennox s40](https://appshunter.io/ios/topics/lennox-s40) · [s40](https://appshunter.io/ios/topics/s40) · [lennox core service app](https://appshunter.io/ios/topics/lennox-core-service-app) · [lenox pro](https://appshunter.io/ios/topics/lenox-pro) · [lennox prodigy](https://appshunter.io/ios/topics/lennox-prodigy) · [lennox smart thermostat](https://appshunter.io/ios/topics/lennox-smart-thermostat) · [lennox smart thermostat app](https://appshunter.io/ios/topics/lennox-smart-thermostat-app) · [lennox home](https://appshunter.io/ios/topics/lennox-home) · [lennox thermostat](https://appshunter.io/ios/topics/lennox-thermostat) · [lennox icomfort m30](https://appshunter.io/ios/topics/lennox-icomfort-m30) · [lenox comfort](https://appshunter.io/ios/topics/lenox-comfort) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-15.*