I have been using one of these to control a wood furnace for several years now, and there is simply nothing better for the job. Prior to this I had tried several other thermostats including a standard Honeywell Round, but none of them controlled the furnace with any accuracy at all (2-4 degree temp swing). This thermostat with it's excellent 'Heat Anticipator' Circuit controls the wood furnace with no more than a 1 degree of temperature swing (unless you over-fire it of course). I am getting ready to install electric radiant floor heat on an inclosed porch, and this is the only thermostat that I am even considering using.