Best HONEYWELL YTHX9421R5051 PRESTIGE 2-WIRE IAQ COMFORT SYSTEM KIT Deals

Customer Ratings:

works perfect on the Geo-thermal system and controls everything, much room to grow. It took me about 2-3 hours to install myself but i worked slow and looked at wiring diagrams to make sure it was done right.

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When I decided to add central air to my home I needed a thermostat that could do heat and AC with the two wires that I had connected to the old thermostat or tear into the walls to run new wires.

After getting over the initial sticker shock I talked to some heating people that I know and I was recommended this system or a very similar system that was just a variant on the same theme. I looked over all the systems and this one appeared to fit my needs best. I wanted heat, AC, scheduling, internet control, humidity and something that was smart (smart as in wouldn't waste energy getting to set-points too early or late).

I had to add on an outdoor combination temperature and humidity sensor along with an internet connector so this review is for the thermostat with those additional items and the added functionality that they provide.

Here are the high points that save me money. The thermostat knows my house and how long it will take to get the temperature to the set point so it does not waste fuel or electricity heating and cooling for too long. If the heat needs to come on 10 minuets or 50 minuets before the set time the thermostat knows and goes into recovery at the right time. This has allowed me to set my thermostat at 70 in the winter for the times I am awake and in the house and spend $50 to $70 over the dumb thermostat set at 68 all the time. Going on vacation, home from work all day the thermostat has settings for that as well so you can be comfortable if you are home or the heat can be set way down if you are not there. If we go out for the day we can turn the heat down then turn it up remotely from a smart phone with an app, or a web site on a computer ) when we are headed for home.

Installation was easy enough, and the HVAC guys got it with some help from me as they had never installed this type of thermostat before they were a little confused by the fact that the thermostat was actually a small computer at the furnace and not a box on the wall in the living space. I did all the wireless syncing myself and when it was all done everyone was impressed at how well it all worked and how easy it was to install. When I first got this thermostat all programing had to be done on the thermostat, now if you have the web interface you can do scheduling, and adjust humidity set-points either on line or with the app.