Honeywell TH4110U2005/U T4 Pro Program Mable Thermostat, White

**This works with a millivolt system!**It was not clear from the product page or other reviews, so I took a gamble on this and connected it to my millivolt system. I connected R to my TH terminal, W to my TP terminal, inserted the two included AA batteries and it Just Works.The mounting plate expects the system's wires to exit through the wall - mine were routed outside the wall from my ancient gas furnace. I filed a channel in the plate to route the wires from the outside in.

I received the correct product in a timely manner. Plugged in an worked first time. An Exact replacement for what i had been using.

We bought these per the recommendation of our electrician who was replacing our thermostats. It is easy to use and adjust, and it appeared easy for our electrician to install.

Overall a nice unit. Comes with a large plastic plate which covers the existing hole. Easy to install and wire up. The drawback - a bit tricky to program. It is very flexible but will require a lot of button pushing and cycling through menus.

Nice looking, clean style wall thermostat. If you know your parameters it's pretty easy and straightforward to setup.

This saved me a ton of money. Love it!

I am very impressed by the design and build quality of this thermostat. The wiring ends use the perfect tool-free method for attachment and detachment. Comes with comprehensive information for multiple applications. Uses extremely low battery current and can be wired to supplied current as well. Very well thought-out product.

Had to spend hundreds of dollars for multiple HVAC repairmen to install this, unsuccessfully, for hours, until finally they replaced it with their own thermostat they had on hand. Then when I returned the product I was charged a $9.50 ‘damage’ fee because it was used…maybe it was a fluke but it was a big waste of money and I was disappointed.