Urgent help regarding thermostat

Guys, HVAC guys are working in my late sixties house with baseboard hydronic heating. I have currently 2 two wired white Rodgers thermostats for heating for two separate zones. Which thermostat should I.go with which works with ST without a common wire? These are heat only.

Third one is AC with compressor only. Current one is some old Lennox/Honeywell. I think there are four wires or something like that. So, which one for central AC?

Really need your help guys at the earliest…so, basically two thermostats for heat only and one thermostat for AC only.

Here’s the picture of the current heating in this thread:

The ecobee 3 has a wiring harness that you install at the unit when you do not have a C-wire. Integrates nicely with ST and works like a charm.

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2GIG CT100 will take batteries (AAs) and should be configurable for both heat-only and for AC only. I’d have to know more about your systems to be sure of compatibility. I do know that the CT100 works with ST (basic Z-wave thermostat).

I think you have a lot of stuff in you house already and may already have temperature sensing, what about virtual thermostats? WAF could be an issue. . . .

@jody.albritton @AaronZON added a previous thread with the picture of the current heat only thermostats…in the original post.

You are definitely not switching the load with that WR thermostat via the red and white wires. That looks to me like a regular thermostat and ‘any’ thermostat that works with ST should be fine. Some electric baseboard heaters are controlled by line-voltage thermostats. Some electric baseboard heaters are called ‘hydronic’ because the electric element is enclosed in a tube containing some glycol solution that circulates within the heater.

However, as mentioned, the stat pictured in the other thread looks like a ‘normal’ 24V unit and the red and white wires appear to be standard 24 GA t-stat wires that would not be capable of carrying the load of an electric baseboard heater.

K. Will order 2 CT100’s for the heating and the ecobee as @jody.albritton suggested for the AC unit and let’s see if the HVAC guys can at least get the basics working…: Heat on/off at least. Will wait for the AC one though as can’t replace it during this crazy NorthEast weather this year.

The HVAC guys think they can get the CT100’s working for heat…the basic part. But the configuring part is on my head… Which should be ok…: as long as they can install and get the basic part working. They have no clue what Zwave is.

And @AaronZON I don’t think they are electric electric per se… I have no clue, I admit though! Gas heating via Weil McLain furnace or something like that…

Hey Ron, I recently installed a CT100 after my heating system blew out my old thermostat. It pairs easily with ST. I suggest using the Better Thermostat with battery and time device type as the standard z-wave thermostat device type has sliders which are a pain to use. Also, keep in mind that while you can set and adjust temp from the CT100 itself you can not program schedules without ST (or other controler). Hope they fixed your heat causes it cold out there and we New Jersians are getting hit with more snow.

Agreed. Weil McLain makes boilers (for hydronic heat). That’s probably what you have. Not electric. I think you will be set with the CT100s. The Z-Wave-ness of the CT100 is completely independent of the thermostat-ness. The HVAC guys should have no problem getting the stats wired for heat. Pairing with ST, as @ErnieG says, is easy.

Thanks guys, i am ordering the ct100s today… Jersey has been brutal this year. Luckily the heat works but the baseboard was making horrible noises of all kind. They are trying to fix that. So got a chance to replace the thermostats. Thanks again!

@AaronZON @jody.albritton this may come as a very dumb question to you guys? My CT100s (2 of them) waiting install in a day or two to replace 2 white and Rodgers. To include them in ST, did you do it after the installation tagging the hub to different floors with one long ethernet cable or the range is good enough? Please help me with the basics.

Just put batteries in them and pair them before the HVAC guys get there.

Thanks a lot. @AaronZON

Still waiting on the HVAC guys! Wonder how busy they are with these NorthEasters! If they are no show by this weekend, I am so going to do it myself and I don’t care if I get electrocuted in the process… :wink:

And the wad of notes they carry in their wallets! Darn, we are the poor guys in IT.

Finally… Two CT100’s installed without common!! Loving it after the museum quality vintage White Rodgers! Paired in seconds. HVAC guys in awe seeing me control it thru the ST mobile app. They came to fix baseboard noise and charged me nothing for installing these as they claimed it was too easy.:wink: humanity is not all dead. Left them a decent tip. Now how to get rid of the sliders! :wink: there is always something…

Wish could get the AC thermostat replaced with an Ecobee but cannot coz of the sub zero temp here. :frowning:

Glad you like your CT100s, @smart. I think I’ve seen alternate z-wave device types here in the community that replace the slider with up/down buttons. Probably worth a try. I have not, myself. If you automate your set-.point changes there’s really no need to worry about the quality of the device type UI. Nothing wrong with the ecobee but just be aware that a CT100 can do your AC-only system as well.

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Have 2 months to think about that! :wink: the original owners didn’t follow the color instructions on the wire for heating… Fortunately the Hvac guys did it and not me.

Thanks everybiody! They are performing quite well in itself. Can somebody help me/point or post a modified device type that you guys are using for this which has the battery, relative humidity readings and doesn’t have the horrid slider? I think I can modify the decent one you suggest and get read if the cooling part as I am using both the CT100’s for heat only.

Can’t thank you enough @AaronZON @jody.albritton and all of you…

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No suggestion for an app for poor old Ron about a decent thermostat app for CT100? Guys? :frowning:

Take a look at this:

Better (different) Thermostat Device

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@AaronZON is the lowes iris model CT101 the same as CT100 and any clue if it works the same way with ST? I have to admit that that they look better than the CT100’s.