Thermostat for new Lennox gas furnace
February 23, 2011 7:37 AM   Subscribe

This is pretty specific, but we have a new Lennox G61-MPP gas furnace and aren't all that happy with the thermostat the contractor installed for it (Pro1 IAQ). Does anyone have any experience with other thermostats compatible with this furnace? Should be able to provide 7 day schedule, advance recovery, and multi-stage heat calls. Thanks!
posted by aught to Home & Garden (5 answers total)
Best answer: My furnace is older and less sophisticated, but I'm very happy with my Robertshaw Deluxe Programmable thermostat. The thermostat comes in several variations to suit different sorts of equipment. Mine has a very straightforward, easy to navigate interface. It also has an outdoor temperature sensor and the ability to control a whole-house humidifier.
posted by jon1270 at 7:48 AM on February 23, 2011

Best answer: I like Honeywell VisionPro thermostats. They have models that support everything you need (I don't have the model numbers memorized, but I think if you go to your site you can find a breakdown of which ones support what).
posted by sharding at 8:13 AM on February 23, 2011

Best answer: I have a similiar model. I think the non comercial version. My installer installed a one stage thermostat and my lennox unit is a two stage furnace.

Make sure you get a two stage thermostat . IF the thermostat is not a two stage one you will have to flip the dip swith on the furnaces control board to tell the unit its being coontroled by a one stage thermostate .This way it will switch to the second stage after a certain amount of time.

The two stages of the furnace is what helps it be efficient at heating.

MY heating bill dropped even further when i realised the installer installed a one stage thermostat on my two stage unit and i switched the dip switch
posted by majortom1981 at 9:28 AM on February 23, 2011

Response by poster: Followup:

It's probably worth mentioning that I ended up trying a Pro1 IAQ thermostat, which I didn't like at all. I don't know if I got a bad unit or if I just don't like the design and programming of the model, but it seemed to have a hard time holding a steady temperature (it would jump up and down several degrees at a time), it only had intelligent recovery for the "Return" phase and not for Wake up (this stunned me), and what "intelligent recovery" it did supposedly have didn't ever manage to get the house to the proper temperature in time.

I returned that and got a Honeywell VisionPro 8000 series (the Honeywell TH8320U1008 to be specific, because that's the one that supports multi-stage furnaces). We're liking that much better; fingers crossed.
posted by aught at 12:53 PM on March 25, 2011

Response by poster: Oh, and it's pretty trivial, but for anyone in the distant future reading this I should mention I actually have a G71-MPP Lennox high-eff. variable capacity furnace, not a G61. I don't think it makes a difference for the thermostat in this case, though. I'd been reading stuff on the Lennox web site the day I posted this, and for whatever reason they call the G71 by a different model number.
posted by aught at 1:06 PM on March 25, 2011

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