White-RodgersEmerson 1F56N-444 Mechanical Heating and Cooling Thermostat

Works as it should, only controls the boiler.Easy to use.

Sent two other brands back before finding one that works. This is the one you want. simple and effective.

works great

Good product and good price

Sometimes the tried and true simple device is the best! I replaced an electronic thermostat on my heating and cooling system that was aggravating the crap out of me. This is a simple electromechanical heating and cooling thermostat - It is NOT for heat pumps though. That requires a different type thermostat.Note that although this is a simple thermostat to operate its not for idiots. If you cycle your air conditioner on then off then back on without waiting the required 3 minutes you may trip the circuit breaker on the AC unit. It's not the fault of the thermostat if you do this - it's a user fault. Every AC manufacturer warns not to do that.Because this is an electro-mechanical thermostat it must be mounted level or the temperature setting may be affected. Get out your level - don't do it by eye.The good - simple & reliable operation. It just works. When you turn on the AC it turns on without delay. When you turn on the heat it turns on without delay. Mine seems to be well calibrated for temperature.Limitations - The thermostat wiring hookup is the old style where you wrap the end of the wire around the screws that are located at seemingly random places on the thermostat base and you have to flatten the thermostat wiring once connected so the the thermostat will connect.Update - Its a little over 2 years later. I have noticed that the thermostat seems to have developed a tendency to excessively stick "on" in either heating or cooling. It sometimes noticeably over heats or over cools by several degrees unless you tap the thermostat. I believe the problem is that the contacts are deteriorating and have some tendency to stick "on". This was precisely why the original mechanical heating and cooling thermostats migrated to using a little mercury capsule with the contacts in it instead of plain mechanical contacts. But modern sensitivities are to reduce or eliminate mercury in most items, so this is what you get.Instead of removing the internal plastic cover over the contacts and cleaning the contacts which might reduce the problem for a while, I replaced this thermostat with a Honeywell non-programable electronic thermostat. The electronic thermostats do not have this wear-out mechanism.This thermostat worked perfectly for over a year, but somewhere between then and just over two years I noticed this flaw in its operation. That causes me to reduce the rating.

Keep it Simple. On/Off. Heat/Cool. Raise/Lower lever. Easy to read thermostat.

I hated my first thermostat that came with my system (could never tell what it was actually set on - I was always too cold or too hot), loathed the second one when the internal battery died (it wasn't great but it was better than the first) , and the one I had Just before buying the White-Rodgers just plain drove me crazy because it was erratic - very erratic.. All well known name brand thermostats sold in box stores everywhere. And then I remembered White-Rodgers from my old system - and wondered if they had a model for my present system... By golly they did!For my installation this was a breeze to do, unhook the old and slap this one in. And then - the reason I bought this - adjust the settings - thermostat, and room read out are all adjustable. The other reason I got this is because it seems to be the only thermostat out there that doesn't have a sneaky little internal battery that will die. Fairly easy install - I recommend that you read and re-read instructions online and in the booklet.Double check that this will in fact work with your system before you order - there is plenty of info on these thermostats so read, read, read - and then order!I'm very happy with this - I expect to remain happy with it for many, many years.

Like the style of this Thermostat :But is was Defective I put the thermostat to Off and the furnace would Random start the blower and shut off and go back on then shut off and then stay off for few minutes then the computer board would be flashing yellow led lights so turn off main power to the furnace to reset computer waited 1 hour tried it again same thing happen I made sure it was wired correct made sure all contacts were not touching anything else..R = RED W= WHITE G=GREEN Y=YELLOW Everything looked good. I called a heating and cooling company told them what happen The service man told me it could be two things Defective Thermostat or a short Somewhere...I Told him it was a new thermostat He said you can get new Defective Thermostat. It happens all the time...so I replaced it with a cheap $20.00 Honeywell from Walmart so far so good Furnace works AC works and the off switch keeps the furnace off... It's so hard to find good quality products today....