What does the wiring on the furnace control board look like ? Wireless capability requires a C (common wire) to run the wirless. Most old homes just have two or three wire
thermostats.
We have had ours about two years and love it.
There are a couple of ways to deal with the C-wire issue, and the manufacturer has gone all-out to make it easy for folks who have an older system. One is if there are any unused wires in the wire bundle run to the thermostat, you can pick up the needed voltage off the transformer that is inevitably down there in the furnace room as part of the setup. Alternatively, with the Filtrete, all you need is a cheapo power supply from Radio Shack, which you can just plug into the outlet nearest the thermostat, and run the little wire behind the wall up or over to the hole where the wires come out for the thermostat. Filtrete even has a how-to video for those who don't know how to fish a little wire through the wall. Finally, you can get lucky (like we were) and have one of those 1960-vintage "clock thermostats" that had a mechanical clock and mechanical day/night timer built in. The power for that will also work; the Filtrete is very flexible on voltages, etc., for powering it, and gives you detailed instructions on how to hook it up, which wire goes where, etc., depending upon what it is to control and how you are powering it. You can pull up the install instructions online at the filtrete web site, and there are a number of YouTube videos by Filtrete on installation, etc.
Oddly, the instructions seem a tad counterintuitive; I mean it can't be that easy, right? They were counterintuitive enough that the mope from our oil heat dealer, who I asked to install it, insisted on wiring the power part his way (after asking "You don't need that wifi stuff, do you?" Uh, yeah, that's sort of the point). After he left, having done a nice, neat, but incorrect installation, I just moved the equivalent of the C wire into the right slot, and VOILA!, worked like a champ. The "right slot", as used in the last sentence, means the one that the INSTRUCTIONS, which I bothered to READ, said it should go in.
We just use ours to control the hydronic heat, so it's not doing anything too complicated. However, it is amazingly-easy to set the 4 temperature/times for each day using the matrix online. I also use it to set it back when nobody will be at home for a day or two, setting it to AWAY mode and HOME mode, as need be, from my smartphone. I have friends who have a weekend/holiday home in the Hamptons and bought this Filtrete thermostat from HD; they set it on "away" when they leave, and set it on "home" when they are within an hour of arrival driving. One of those little conveniences that you didn't appreciate until you had it.