LUX Wifi Thermostat Reviews and Buying Guide 2021

The popular Lux Geo thermostat is often discussed alongside Nest, Honeywell Lyric and ecobee thermostats. But Lux also makes highly functional Lux Kono Smart thermostats and a diverse line of Lux non-WiFi thermostats branded as Brio thermostats. This Lux WiFi thermostat buying guide focuses on comparing Geo and Kono Smart thermostats. Among the 14 Brio thermostats are models for 24-volt and line voltage HVAC systems.

For comparison of models and features, see our guides to these smart thermostat brands:

And those from popular HVAC brands like Trane, Lennox, Rheem/Ruud and Goodman.

Lux WiFi models are summarized in this table.

Lux ModelHeatingCoolingWiFiSmart HomeProgrammable
Geo-BL & Geo-WH2 stages2 stagesYesAlexa, Google Assistant7-day
Kono Smart2 stages1 stageYesSame as Geo + Apple HomeKit7-day

Lux Geo Thermostat

Lux calls this control a “smart, easy to install, easy to use” model, and it is. The Lux Geo is available in black with black chrome (Geo-BL) or pearl white with brushed chrome (Geo-WH) and can be installed as a vertical/portrait or horizontal/landscape thermostat. Simply install the thermostat using the wiring diagram included. Download the app (iOS or Android) to your devices, and create a user account. Prompts to follow appear on the Geo screen and the app, and in a few simple steps including connecting to WiFi, remotely controlling the thermostat is possible.

What are the pros and cons of the Lux Geo thermostat? Let’s review those we haven’t yet mentioned.

Lux Geo Thermostat Pros:

  • Geofencing allows you to set neighborhood boundaries. The thermostat adjusts to Home and Away settings automatically as your phone crosses the boundaries.
  • Four power options: Two AA batteries, micro USB, C wire or Lux Power Bridge (included) in place of a C wire
  • Works with Amazon Alex and Google Assistant.
  • Multiple thermostats can be controlled from the app.
  • Works with most 24-volt systems including heat pumps, hydronic plus gas millivolt systems.
  • Knowledgeable support from Lux.

Lux Geo Thermostat Cons:

  • Must have a C wire installed or the Power Bridge to work with Alexa and Google Assistant.
  • Does not support 2-stage heat pump compressors.
  • The display is small and not a touchscreen.
  • While a smart thermostat, this is not a learning thermostat, though some consider this a plus due to the quirkiness learning thermostats often exhibit.
  • Temperature sensor only (no humidity or motion)

Note on the Lux Power Bridge: a C wire, or common wire, gives the thermostat continuous 24V power for precise temperature readings. If your HVAC system’s last thermostat was not wired with a C wire, our C Wire Guide gives you options. One of those is to use a device like the Lux Power Bridge (a $20 part when sold separately) to “borrow” power from another wire.

Lux Kono Smart Thermostat

Kono is the Hawaiian word for “invitation,” and Lux explains this thermostat makes your home very inviting. At $149, higher from some sellers, the MSRP is higher than the Geo. For the money, the Lux Kono offers an energy use estimator and more smart home options. It is shipped with a handsome stainless black case, but decor snap covers are available separately for $10 each in five colors and paintable primed. The setup is essentially the same as it is for the Geo.

Here are Lux Kono pros and cons:

Lux Kono Smart Pros:

  • Use is simple – Push the knob to move through five modes, and turn it to make your adjustment within each mode.
  • Geofencing automates system adjustments that save energy and allow you to return to a comfortable home.
  • IAQ fan mode – While many thermostats have auto fan and continuous-On modes, the Kono also has IAQ mode that cycles the fan on and off periodically to freshen air.
  • Works with Apple HomeKit plus Google Assistant and Amazon Alexa.
  • Supports most 24-volt HVAC systems with up to 2 heating and 1 cooling modes (conventional and heat pump systems including auxiliary heat) plus electric furnaces.
  • Does not require a battery.

Lux Kono Smart Cons:

  • Lux uses the terms “adaptive” and “learning,” but this is not a learning thermostat like the nest. The terms mean that your programmed schedule can be paused and a temperature can be set and held until you choose to return to the schedule.
  • Requires a C wire for power or the included Lux PowerBridge adapter.
  • Supports just one cooling stage.
  • Lux customer service gets high marks in general, though we found that some agents are still getting familiar with the Kono Smart and couldn’t provide answers. That might have changed by the time you’re reading this guide.
  • No motion sensor, unlike Nest and Ecobee models, so display is always lit.

We recommend comparing the Lux Geo and Lux Kono directly to Emerson Sensi, Honeywell Lyric T5 and ecobee3 Lite.

Which Lux WiFi Thermostat is Right for You?

If you have a heat pump with a two-stage compressor, neither Lux WiFi thermostat is compatible, so that’s your first consideration.

Otherwise, there is little functional difference between the two. Both offer geofencing and remote WiFi monitoring and control, the most important features, in our estimation. If you want to use the thermostat with Apple HomeKit, then the Kono is your only option. The Kono’s option to pause the schedule is a minor consideration unless you have a very irregular schedule.

Beyond these features, it might come down to cost, where Lux has a slight affordability advantage, or to looks where the Kono and its optional decor covers give you more options.

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