Lux LTX100E Programmable 7 Day Thermostat; 1 Heat, 1 Cool

For years the main house thermostat for my Carrier gas furnace/air conditioning was a programmable electronic unit. The temperature was just never right. Running the program by clock and calendar to set temperatures is unrealistic, at least in U.S. Georgia. I found myself constantly fiddling with the override function to keep humidity at a tolerable level, as well as temperature. The display and control buttons were tiny, which was another aggravating factor. Programming that thing required walking through 6 or more daily settings for weekdays, and repeating the whole process for weekends. I ended up truly hating that programmable thermostat.The present non-programmable thermostat made things simple and easy to use. Large (finally!) buttons allow temperature adjustment, and the large digital display lets me operate it without putting on my reading glasses first. It's convenient and user-friendly. Installation took only a few minutes thanks to the color-coded terminals which matched the colors of the control wiring.

So far I'm pretty impressed. My old one was starting to have troubles (it would actually randomly cut the fan off and on a lot during cooling) so I decided to take a chance on a brand I've never heard of. One of the first things I noticed between the two is the old one is a lot more old fashioned with huge capacitors and resistors everywhere and etc while this one has almost nothing at all on the back end of the board and presumably small SMD components on the front. Much more modern definitely. The screen is very clear and easy to work with -- far better than the old one -- and programming is overall easier except some of the advanced settings are very proprietary (some are just numbers. Setting #1, 1, 2, 3, etc.) If you lose the manual you have to pull it apart to see the very minimal guide on the inside (which doesn't go into details) or google for another copy of the manual. Chances are you never need to change any of those after the first time though and I'd bet that it remembers them even if the batteries die.Pretty much the only real room for improvement I really saw is that, as usual, there are only whole numbers. With Fahrenheit this isn't as big of a deal, but if you like to use Celsius as I do, at many times you really kind of want a bit more precision (0.5 intervals would probably be perfect.) One degree change in Celsius is equivalent almost to two degrees Fahrenheit (more or less anyway,) so while I understand the oversight since most develop these with Fahrenheit in mind, it is a bit annoying that so few think of this. I set the swing temperature a bit higher (setting #8, value on 2 if I recall) and it helps a bit since it will cool just a tiny bit more before it shuts off, but it also takes a bit longer to kick in I suppose. After some playing around I seem to have found a point that is fairly comfortable anyway, but it seems silly because I tested its temperature calibration and I think it internally does actually recognize 0.1C precision internally, it just doesn't give you access to that level of precision.

Replaced older model. Wasn't ready to go full smart. Easy to install. Good instructions.

I have an steam boiler that heats an old brick three-flat. For the steam to be evenly distributed to all units, the boiler must be energized for an extended period of time. So I need to set "the swing" (the degree difference between the cut-on and cut-off settings) at 2.5 degrees. But most of the current thermostats don't allow you to program the swing (which is factory set, usually at 0.25 or 0.5 degrees). If I used those thermostats, the first floor unit would be warm and the third floor unit would be cold. So I appreciate that Lux thermostats allow the customer to set the swing according to their unique needs. Plus a wider swing will prevent your boiler or furnace/AC from cycling excessively. As far as the remaining features, the Lux is user-friendly and easy to program. Reasonably priced, as well. Five stars from me!

Worked as expected!

Controls on the front panel, easy to see. Lighted display is great! Wiring diagrams are easy to understand if you are replacing an existing thermostat. Not so sure about new installations. My only complaint is the terminal block. If you are a DYI installer, you will need a tiny screwdriver and a forceps or tweezers to insert wires into the terminal spaces. Older LUX models had big screw terminals. This is important because you will likely find that the wires are solid conductors and not forgiving to too much twisting and bending. So be careful not to break a wire or you may be forced to pull a new set all the way from the furnace J box. That said, if you wired it correctly, it will work flawlessly. Programming start times is easy after a little practice, but there are no stop times, meaning a time zone will simply move on to the next zone. Considering the price, this is a high quality thermostat that will do the job at a reasonable purchase price.

Works the way we want it to - and we have control (unlike with a smart thermostat). Great price, too. Very happy with this purchase.

did not like that the display only shows room temp in non-programable mode.much prefer the P111 stat

The only thing I found difficult about installation was having to drill a couple of new holes in the wall because it didn't fit the same way as the old one. Other than that it was straightforward. I really like the flexibility of the settings and I had to experiment with them a bit at first to get things just right. I'm quite satisfied with the way I have it set up now. It's definitely better than the one I replaced with it. I really like the fact that it uses AA batteries instead of AAA because they're less expensive. I also like the fact that it has a three-year warranty instead of just one-year. I definitely recommend this model.

This is the best thermostat I have ever installed on basic heat/cool system!The display has huge easy to read numbers and a backlight that lights up for 10 seconds.It's simple to install, program and calibrate if required.There are Hold and Override functions too.I purchased it because most other brands do not have such a low differential setting available and cause the rooms to have huge uncomfortable temperature swings. This thermostat is so good it keeps the rooms at a steady comfortable temperature.Only negative is it has to be unclipped from its back wall plate to change the batteries.

Works like a charm.

So many programming options and the installation was a piece of cake. Programming instructions were so easy to follow.Works like a charm. Replaced a manual 28 years old Honeywell thermostat in my house (with mercury switch). It looks beautiful (stunning optics). I am very happy with this thermostat. Actually I bought 4 more. Two for a charitable organization and a friend of mine wanted two. Thanks

thank you got it today! thank you.... fits great! just what i needed! very fast shipping too was easy to install