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Lux Wi-fi Thermostat Reviews

As a homeowner you ought to know the importance of having a thermostat in your home, yet many homeowners don’t see the point in spending money on buying one for their house.

As a result, the importance and value of a thermostat tends to be completely diminished and overlooked by many.

Talking to skeptic owners…

There are great benefits that having a thermostat can bring to your home, such as

  • Saving money
  • Be in complete control of your heating system
  • Not Having to deal with the hassle of turning heating/cooling on/off

However, all thermostats are not made equal as there are different types that will bring you different benefits.

Here is to an honest and deep review about the programmable thermostats from Lux, so you can make the best decision without getting your hands dirty, and seek through tons of catalogues and customer reviews.

Top Features of Programmable Lux Thermostats

GEO/Lux thermostats are part of the programmable thermostats variety from Lux that falls into the category of Smart thermostats, meaning that you can easily program and control them via smartphone through an app.

They also have wi-fi connection, and the installation is easy as the manual comes with instructions that are not difficult or highly technical to follow.

The design of the GEO/Lux is both fancy and practical and comes in black and white finishing colors.

Let’s jump right into the features:

It measures and displays the main important factors such as

  • Target and current room temperatures
  • Heating mode (Heat, Cool, Off)
  • Wi-fi status
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    Date and time
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    Programming menu
  1. You can sync it with Amazon Alexa as well as the Google Assistant, and the smartphone app is available for both iOS and Android systems. It is easy to schedule and lets you control multiple thermostats in one or more locations.
  2. It can be powered easily through universal options that comes from 2-AA lithium batteries, to a c-wire, a micro USB or LUX Power Bridge.
  3. It has room for two-stage heating/one-stage cooling systems that support the most common variety of heaters. It also offers support for blower fan, air conditioning and damper devices.
  4. Heating and cooling schedules can be programmed throughout the week as well as personalized schedules for each day.
  5. It has a geofencing system that allows you to set the distance perimeter by yourself. It also allows you to know the current outdoor temperature of the perimeter.
  6. Its patented Clean Cycle® fan circulation allows to always keep your home fresh and free of pathogens and pollutants that can damage your health.
  7. You can connect up to 10 terminals that have both conventional and heat pump HVAC (Heating, Ventilating and Air Conditioning) systems. That means that a small-medium house comes in handy for this thermostat.

The TX9100U is not as modern as the Geo but is a fully 7-day programmable energy saving thermostat that is reported to be extremely accurate and have been reliable over the years.

The main features are:

  • You can manually select times and temperatures that best match your daily schedules and comfort levels, but it also has a default heating/cooling schedule that allows you to save up to $500 a year in energy bills.
  • It has all the features for ease of use and convenience that makes the usage safe and easy to learn even for the not-so tech enthusiasts.
  • It has a vacation hold mode that ensures the heating/cooling system of your house is not running while you’re away.
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    The installation is simple, and it is compatible with all of the most common heating/cooling systems out there.
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    It measures and displays the information with extreme accuracy and has all that it takes to make up for a very reliable thermostat that will provide your home comfort and energy saving throughout the years.

If you’ve always used mechanical thermostats and are not familiar with programmable thermostats , the Lux TX9600TS is the best option to go programmable as it is easy to install and once running, you can mostly forget about it.

The main features include:

  • A touchscreen display with large enough numbers and letters that ensures a comfortable set up. It also has a backlight, so you can effortlessly read it at night.
  • Though it lacks automation and wi-fi connection, you can easily program it for each day of the week, as well as the multistage heating implementation of four cycles per day.
  • The temperature swing is of .25 degrees which is smaller than many other more modern and high-tech counterparts.
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    It works very well, reads information very accurately, and has a three-year warranty without needing any previous registration.

Closing in on the set of options, there is the Lux Kono KN-S-MG1, the younger brother of the Geo/Lux thermostat. It mostly delivers the same features as the Geo but with a more elegant and minimalist design that can be personalized according to your taste.

That’s why the Kono KN-S-MG1 comes with various faceplate colors that can be swapped to fit the room’s style, or you can even go further and have your own personal touch painted in a self-customizable faceplate.

Let’s have a look at the features:

Essentially, there is not that much of a dramatic improvement in comparison to the Geo/Lux, as the Konos comes with the exact same features and concept. In addition to that it does seem to come with a wiring bridge for the homes that lack a C wire on their HVAC systems.

How to Install Lux Thermostat

Generally speaking, when it comes to installation, the lux thermostat wiring is quite simple and easy to do, as the user manuals are very detailed and well explained with instructions that are user friendly.

However, in this section we tackle them one by one in an orderly way, the steps to follow and the more general things to look for when installing each one of these Lux models so you have no problem in installing them on your own.

Before installing you want to make sure that your wiring set-up is compatible with the thermostat.

Here are the installation steps...

  • Begin by ensuring the power of your HVAC is off as you don’t want any accidents to happen to you or your family members.
  • If you happen to already have an old thermostat, remove the front portion to expose the wiring set-up.
  • You need to be familiar with the labelling code of your wire set-up as there are some setups that rely on color or numbers and letters. The manual is the best guide to do that, as the thermostat wiring diagram comes with these specifications.
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    Remove the old thermostat and wrap the wires to a pencil-like object so they don’t fall back into the wall.
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    With the help of a cutter, cut out the old bare copper and make a new incision around the new portion of each wire, ensuring that you have ⅜ of an inch of exposed clean bare copper.
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    Attach the new Lux thermostat platform to the ground. In the case of the smart thermostats, you don’t even have to add new holes to the wall as they can be mounted horizontally and vertically without any screws.
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    Route the wires and position them on the terminal block.
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    Attach the base permanently, and connect the wires according to the user manual
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    Put the batteries in and attach the Lux programmable thermostat to the base
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    Set the clock and finally the program.

You’re ready to go.

Lux Thermostat Wiring Diagram

If you have just read the installation section of this article and came here way more confused and anxious than before because you didn’t understand anything, don’t worry. There are times in life when we are faced with new things that scare us.

If you happen to be a person who doesn’t know anything about installing thermostats, let alone properly reading a wiring diagram for installation, keep reading.

In this section we’ll show you the basics of thermostat wiring and installation, so you can have a good understanding of your house heating/cooling system and don’t roll your eyes so far back that you can almost see your brain when having to interpret the thermostat wiring diagram.

So, bear with me…

For starters, when it comes to your heating/cooling system, most vintage systems are basic, meaning that they only have two wires for control.

Those wires work in the same way as an on-off switch, with the slight difference of having a control mechanical or electronic mechanism that regulates the temperature and acts as the main operator of the switch.

The single-stage terminals on the thermostat are defined as,

  • ‘R’ - Heat/Cool system
  • ‘Rh’- Heating power supply
  • ‘Rc’- Cooling power supply
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    ‘W’ - Heat relay

    The power source comes from a control transformer that can be located outside, or inside the furnace body. This way, the line voltage that feeds the furnace gets decreased to a safe voltage of 24V.

    Moreover, after making a series of loops through at least one safety device like an over- temperature shutdown, the power goes up to the thermostat.

    Finally, when the temperature descends below the limit, the contacts close and complete the circuit to the gas valve which causes it to open again, start the burner ignition and so have the heating cycle begin.

    Then the fan on-auto switch function was introduced to help circulate the air, by using the furnace fan and keeping the circulating air temperature intact. This terminal was labeled ‘G’ and it interacts with ‘R’ terminals for directly turning on the relay’s blower motor.

    Lux digital thermostats sometimes need another wire for a terminal labeled ‘C’ to allow a common connection from the control transformer, that will constantly provide 24V power between terminal ‘R’ and ‘C’ to keep the thermostat running.

    However, if you can’t or just won't buy that extra cable you can go for battery powered thermostats, but keep in mind that each time the batteries run out of energy, the thermostat just won't do its thing.

    Finally, here are the additional terminal interpretations for more complex systems that are second- staged.

  1. W1- W2: Heating
  2. Y1- Y2: Cooling

Lux Thermostat Swing Setting

Lux programmable thermostats come with a function called swing control. This function plays a key factor on the thermostat, because it allows the adjustment of the range of temperatures in which the thermostat won’t switch on.

All Lux thermostats can be adjusted in 0.25 Fahrenheit degree increments, while some others have larger increments of 1°F.

Generally speaking, the smaller the increments, the more temperature control you have and the more energy you save.

Nevertheless, it seems that the Lux swing control function tends to be overlooked these days by the tendency of going for more high-tech features that allows remote control of the thermostat from a smartphone, rather than look for something that will actually help your HVAC system.

That’s why in this section we help you by clarifying everything you need to know about the Lux swing setting functions, and how you can use these to your advantage to help you save money as well as not wearing out your heating/cooling system way too quickly.

It goes like this, each time the heater raises the room temperature to your programmed set point temperature, the heating cycles per hour function notices when the set point is about to be reached.

So, for example if you have set the temperature at 69°, an anticipator circuit cuts off the heat at a predetermined point, say 68° to stop the heating surpass the mark, so the residual heat will raise the room temperature to the desired 69°.

The swing setting function on the Lux thermostat needs to be performed in time, because the thermostat is configured to automatically exit the screen after 10 seconds of not pressing any button.

The swing setting in the LUX/GEO smart thermostat can be configured by the wheel control that helps you navigate through the options and values

  1. By pressing ▲, you select a feature.
  2. By pressing ╳, you go back.

The Lux TX91000U model can be swing set as follows:

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  • Ensure the switch system is off and the set slide switch is on Run
  • Press and hold the Hold button for 5 seconds (Words SET and SWING will appear in the upper right corner of the screen, along with a single flashing digit)
  • Use the “Up”/“Down” buttons to change value (between #1 to #9)
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    Press the “Next” button
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    Proceed to the Offset setting

In order for you to change the Swing in the TX9600TS model, you’ll need to:

  • Press “Menu” button
  • Press “Scroll” button until Set/ Swing is displayed on the screen
  • Press “Ok” button ( “ADJUST VALUE SWING” will appear at the top of the screen with a single flashing digit)
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    Use the “Up” / “Down” buttons to change value (between #1 to #9)
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    Press “Next” button
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    Proceed to the Offset setting

You’re good to go.

The Swing value on the Kono KN-S-MG1 smart model is set by the wheel which will mark a certain number on the screen as you turn it. The Swing Temperature setting is at number 9.

The values you can select are:

  • .25°
  • .5°
  • 2.25°

Lux Thermostat Troubleshooting

Once in a while the thermostats will tend to malfunction and shut off, because of various combined factors.

That’s why we’ve gone through all of the single official troubleshooting Lux manuals to list the main common issues that might affect the temperature regulation of the models, along with possible resolutions that can help to figure out these issues.


Make Sure To

HVAC System won't run

  • Flip the circuit switch into the off position and back into the on position.
  • ​​Replace the batteries if the thermostat runs on batteries

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    Check for software-related issues for smart thermostats

Room temperature won’t match thermostat

  • Make sure the thermostat is level and clean
  • ​Go to manual and check wiring diagram for proper installation

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    Check if the unit is not being directly exposed to sunlight

Thermostat won’t heat or even function at All

  • Go to manual and check wiring diagram for proper installation
  • ​Reset the thermostat and replace batteries if the unit runs on batteries

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    If nothing works the problem might be an HVAC malfunction

Honeywell Vs Lux - Which One Is Better and Why?

Over the research we’ve been doing in this in-depth thermostat review, we have encountered a common pattern. People who don’t end up loving Lux change to Honeywell or vice versa. There seems to be some kind of natural rivalry between the two brands.

We’ve discovered that both Lux and Honeywell have generally speaking the same kind of products. They both have programmable thermostats with touchscreens and the smart thermostats line of products. The features of their products are also very similar.

Here we are laying out our very own results, so you get to decide which ones suit you best. We compare the general lines of products so you have a better general view on both Honeywell and Lux programmable thermostat lines.


  • Many useful features
    HD touchscreen color display
  • Bright responsive touch screens
    Compatibility with HVAC systems
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    Scheduling possibilities
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    Smart response technology
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    5-year registered warranty
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    Informs AC malfunctions
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    Easy programming

Emerson UP400 Touchscreen
  • Bad quality on enclosure
    Large, easy-to-read 12 sq
  • Only works with one stage heating/cooling
    Compatibility with HVAC systems
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    Unattractive design

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    Lacks humidity sensor


  • Affordable price
    HD touchscreen color display
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  • Efficient app
    Compatibility with HVAC systems
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    Screw free mounting
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    Easy installation
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    Easy programming
Emerson UP400 Touchscreen
  • Complicated screen
    Large, easy-to-read 12 sq
  • It’s too basic
    Compatibility with HVAC systems
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    Don’t operate on electric heaters
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    Not enough high-tech features

Top 3 Models

We hope that after reading this in-depth review, you are better equipped when it comes to buying the right thermostat for your home.

Now for the top 3 Lux thermostat models as well as the list of pros and cons you might take into account before deciding which one to buy.

TX9600TS (Pros and Cons)

The TX9600TS model is the best model if you are considering jumping from mechanical thermostats to programmable thermostats. The design features are pretty basic, yet it is super easy and comfy to install and program, as once running you can just forget about it and enjoy.

When it comes to this particular model, the advantages that stand out are.

  • Accurate temperature reading
  • User friendly display
  • Large design and touchscreen that makes it very easy to access
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    Protection code for unauthorized users
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    An incredibly affordable price (half as cheap as their counterparts)
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    Vacation hold mode that turns the thermostat off when you are away for many days

On the contrast the main cons of this model have more to do with it being a really basic, low-tech model that doesn’t carry many of the assets of the more high-tech competitors, like wi-fi connection, geofencing or the use of a remote control.

TX9100U (Pros and Cons)

The Lux TX9100U offers all the features of a basic programmable thermostat, but unlike many other high-tech systems, this one has just enough features and the guarantee that it does its job exceedingly well, as it is highly accurate and built to last.

Other pros of this model include:

  • Being compatible with almost every North American heating/cooling systems unless they draw power from electricity.
  • This one does support both single and multistage heating/cooling systems
  • It only costs ⅓ of the price of its more modern wi-fi enabled counterparts.

The cons of the TX9100U include:

It is limited to not being compatible with heaters that function under electrical power.

Lately, there seems to be an issue involved with the “lo Batt” sign being constantly shown even after buying brand new batteries. Because this is solely a battery-operated system an error of this nature keeps the thermostat from running, so you must keep an eye on that.

Kono KN-S-MG1 Thermostat (Pros and Cons)

The Lux Kono KN-S-MG1, mostly delivers the same features as the Geo but with a more elegant and minimalist design that can be personalized according to your taste.

The pros of the Lux Kono KN-S-MG1 include

  • Fancy design that can be customized
  • Reliable app that controls the thermostat from whenever you are
  • Wiring bridge for the homes that lack a C wire

On the other hand, the cons of the Lux Kono KN-S-MG1 include 

  • Hard to read screen as it doesn’t display all the features other than temperature and wi-fi signal.
  • It’s lacks high tech features like the other smart competitors.

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