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Availability:
In Stock.
Arrives
Monday, Jan 26
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Style: LTX9100U (7 Day)
Features
- Lux Pro Thermostat: A versatile solution for precise climate control
- House Thermostat: Designed to efficiently regulate indoor temperature for comfort
- Programmable Thermostat: Customize your heating and cooling schedule for energy efficiency
- Digital Thermostat: Easy-to-read display and precise temperature control for your comfort
- 7-Day Programmable Thermostat: Set different schedules for each day of the week
Brand: LUX
Model Name: LTX9100U-A04
Controller Type: Push Button
Special Feature: Programmable
Color: White
Brand: LUX
Model Name: LTX9100U-A04
Controller Type: Push Button
Special Feature: Programmable
Color: White
Temperature Control Type: Programmable
Connectivity Technology: Wi-Fi
Included Components: LTX9100U-A04 Programmable 7 Day Thermostat
Power Source: Battery Powered
Voltage: 24 Volts
Material: Plastic
Shape: Rectangular
Display Type: Digital
Control Type: Button Control
Control Method: Touch
Connectivity Protocol: Wi-Fi
Mounting Type: Wall Mount
Style: LTX9100U (7 Day)
Backlight: Yes
Specification Met: Energy Saving Thermostat
Number of Batteries: 2 AA batteries required.
UPC: 021079119103 784497557147
Global Trade Identification Number: 03
Manufacturer: EME Delaware
Product Dimensions: 10.5 x 8 x 1.25 inches
Item Weight: 8.4 ounces
Item model number: LTX9100U-A04
Batteries: 2 AA batteries required.
Is Discontinued By Manufacturer: No
Date First Available: May 21, 2013
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Jan 26
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Style: LTX500U (5-2 Day)
Worked out perfectly for our home. Easy installation, the settings are off standard but it’s programmable which I’d in a later part of the month. Very happy and satisfied with the item.
Reviewed in the United States on November 6, 2025 by It’s a beautiful serum. Provides a nice glow to the face.
Style: LTX500U (5-2 Day)
Works Perfect. Easy install.
Reviewed in the United States on December 23, 2025 by CAG129
Style: LTX9100U (7 Day)
I've been wanting my own programmable thermostat for years now, but apartment living has been a damper to that ... so this is the first unit I've owned. It's nice and appears to work and comes at a decent price, but it's not that user friendly. Installation was fairly easy. As a new home owner, my opinion on this may be somewhat tainted in that I haven't done a lot of around-the-house labor to have a good scale of difficulty built up, but then again, if I can do it, it's probably pretty simple. I have VERY limited electrical wiring experience, but the instructions are clear enough in this regard to walk you through it. And they include 6 diagrams for the 6 most common home HVAC wiring schemes, with each of those including possible variations on wire labels. My biggest complaint here is that the included paper instruction manual is basically a single large sheet of paper that is somewhat confusing and extremely simplistic. The included manual does make it clear that the full manual is available online as a PDF, but the problem is that they tried to include both the installation and the operation instructions on the one sheet of paper ... if you're going to omit material and tell someone to go to the website to read the whole thing, at least include all of the INSTALLATION instructions. Along with that, there wasn't much help in trying to sort out what type of system your house might have (if say, you've only lived there a month). Operation is a little more wonky. My complaints here are not about functionality ... in fact, this programmable thermostat has quite a few features for something so reasonably priced. I actually didn't expect things like "smart recovery" (where it learns how long it takes the HVAC to reach the desire temperature, then starts it up BEFORE the desired time so that the desired temperature is reached ahead of time) or filter reminders. The problem is that the actual user interface and the methods by which you interact with the thermostat are not intuitive or friendly. The basics are obvious enough, but for things like accessing display features or system running customization, it becomes something of a chore that will require you to check the manual. For example, just to change something like temperature display (Fahrenheit or Celcius), you have to set the HEAT / COOL switch to off, then hold NEXT for 5 seconds, which pops up a series of VERY simply worded phrases that amount to a number and a short-hand, and you have to scroll through these from beginning to end, with no jumping forward or backward option. This is the case for most of the program features. One lucky break: the thermostat includes a COPY feature, which lets you copy an entire day's worth of programed temperatures and times to another day. Without this, it would take you a good 10 minutes or more just to program the 4 periods of the 7 days. So while I highly recommend this thermostat for the reasonable price and various programmable features, along with the 7 day format, be aware that it is not easy to interact with, and you'll probably need to consult the manual anytime you need to change something other than the current temperature. -- EDIT: As a quick pointer, I notice that this thermostat, or maybe it's just thermostats in general, does not like rechargeable batteries. It seems there is some kind of voltage problem, as it shows as full for about a week or so, then suddenly the battery is dead. However, when I use standard one-use AA batteries, it works fine ... and in fact, I haven't replaced the batteries for well over a month now. --
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Reviewed in the United States on July 14, 2014 by Anubis
Style: P621U (5-1-1)
I've been using Lux thermostats since 2009, when I bought my TX1500E, a model they no longer make, but have replaced with something similar, the TX1500RU (or something like that) Unfortunately, that one wasn't quickly available so I selected the P621U as a near-equivalent. The TX series uses exactly the same back plate, so no rewiring would have been required. Alas, it was not to be. The more readily available P621U-010 is similar in capability with the TX1500E, but has a slightly different form factor. Therefore the back plates are not interchangeable between the two models. Good news is that the footprint on the wall is the same, as is the mounting screw hole configuration. So, as long as your connecting wires are not super short, you'll be fine with a direct physical swap of the two entire units. The entire install, including removal, relocate, wire swap and programming of the new t-stat required less than 25 minutes, including clean up. it is an easy job. The directions provide clear well defined wiring schematic renderings for each of the possible system configurations. You will need to know which yours is. Because I was doing a straight swap, mine was super easy - with a wire-for-wire swap out. The Lux diagrams use standard class 2 wiring color schemes for the wires in question, so as long as your system is wired properly with typical class 2 wiring colors properly installed by your HVAC installer, you're good to go. Lux goes one further and explains what the wire DOES - not just "use white" or "use blue". So, if your colors are messed up by a bad install, you can still figure out what is what from how they're connected on the business end at your unit. This is a good feature in the directions and gets an extra kudo from me (speaking as a tech-savvy person with an EPA HVAC certification.) The programming of this unit is straightforward and intuitive. Being familiar with the Lux family of thermostats, I was able to move directly to programming - which was functionally exactly the same as programming my sixteen year old Lux TX1500E. This too is an admirable behavior by this manufacturer, and also deserves mention. Keeping programming "boring" and "the same" may not make the marketing wonks happy, but it definitely serves the end user very well. Extra kudos to Lux for this decision. Tell your marketing wonks to go have a conference or something... :-) The quality of this unit seems fine. The backlight blue display is clear and easy to read, and makes logical sense. It is identical to my other two Lux TX series in appearance, and both of them have remained bright, sharp and fully functional for sixteen years. Some logical improvements were made on this design. In particular, certain primary function buttons are moved out front and center - independent of the cover, a slight improvement over the TX1500E. Once programmed you probably won't have to open the cover except for extraordinary reasons like resetting the filter reminder, etc. The unit also features a "Setback" function, something the TX1500 lacked, and which I find handy. It is a primary button, accessible at all times. Physical wiring was fairly straightfoward - however be aware that the quality of the screw terminal strips securing the control wires is a little lower compared to the older TX1500E series. It is not terrible, but it is just not as sturdy. In particular, the screws themselves have a poorly selected cross-type head (aka "phillips") profile. Now, I am a tool guy, and I pride myself on the quality and breadth of my screwdriver selection. I have about anything you might imagine and a lot of weird stuff most folks don't know even exists. Besides every Phillips profile known to man, and JIS standards, I have other stuff, like Reed Prince, Torx, MorTorq, Tri-screw, Pentalobe, Frearson, Pozidriv, and a lot of other weird types you've never heard of. That said, I struggled to find a screw driver profile from my vast collection that really felt 100% accurate and secure in this device's terminal strips. I finally settled on a #1 Phillips as the best compromise...but even it wasn't that great. In addition the engagement slots for the wires are shallow and dead ended, which means you will likely need to trim your bare wires from the typical 5/8" strip-back typical of these installs. Because the strips themselves are a bit flimsy, it felt riskier than usual to apply enough push to keep the badly profiled screws from stripping out at the drive point. I didn't strip them, but they just did not feel anywhere near as good as the old TX1500 terminal points. But in the end, these are minor quibbles. The t-stat works well, it mounts quickly and easily and works flawlessly. Based on the sixteen year service life of my last Lux thermostat, i'm confident this one will go the distance. FWIW, my last thermostat failure was the mechanical relay that controlled the 24V signal to the unit. I could have replaced the relay, but chose to replace the entire t-stat, for the sake of time. This unit uses a physically smaller relay, so only time will tell how well it will hold up to repeated cycling. The previous relay used a pair of snubber diodes to manage contact arcing - perhaps this one does as well? I didn't disassemble it to see. FIve stars - recommended if you need a good basic easy to program 5+1+1 t-stat with filter function and system flexibility to work with conventional single and two stage package units, split systems, heat pumps, and the like.
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Reviewed in the United States on October 29, 2025 by Ockham