I have a Lennox G61 with a Surelight 49M5901 board. The furnace is a two stage heat with variable speed blower. The Lennox 81M2701 thermostat that is not working (display messed up and won't turn furnace off ever). I need a replacement, but it seems that all the thermostats I look at do not have the "D" contact that the 81M2701 has, which I think controls the variable speed blower. I'm not sure how important that all is. I do have A/C with this unit, but no hudmidifier or dehumidifier. I would love one of those cool looking color wifi thermostats, or even the ordinary looking Honeywell wifi one sold at Home Depot, but when I look at the installation instructions for them, they do not have a "D" contact. Even the fancy new Lennox Wi-Fi thermostat says it will only work with a couple of their furnaces, mine not being one of them.
Can someone suggest a thermostat for me? I thought this would be simple! Merry Christmas to everyone.