I have a Goodman GMVC95 furnace, installed a few weeks ago. I also have a separately controlled Aprilaire 224 humidifier with it's own 24v transformer. The technician installed the furnace leaving the single stage thermostat. I bought a multistage thermostat - Robertshaw 9025i, which also has humidity control. I would like to eliminate the old Aprilaire manual humidistat and utilize the control built into the Robertshaw thermostat. Can you advise me on how to configure the connections?

Between the furnace, humidifier, and thermostat instructions you should be able to get it hooked up. Just a matter of a bit of reading and comprehending what you read to make it all work. However, I would suggest having the original installer of the equiptment come do it to give you a little peace of mind.

I suggest you remove & discard the humidifier. If you need the extra humidity get a free standing humidifier. Furnace connected humidifiers are some of the worst things you can use due to furnace damage as well as creating an environment for mold.

I have to respectfully disagree, Grady. A properly installed and maintained (maintenance is key) whole house humidifier can do wonders in extremely dry climates. Absolutely no more of a mold or damage issue than a central a/c system is.

No offense taken or intended.

Maybe things are different in your neck of the woods but around here, there are VERY few which don't cause more trouble than they cure. The evaporative grid type foul rapidly & are usually beyond cleaning due to silicate build up, steamers burnout elements for the same reason, & spray misters rot out heat exchangers due to the nozzle getting crapped up.

Can't argue with your logic. In my area, it gets so dry in the winter months that whole house humidification is the only real cure. We use the evaporative grid type, but are very, very strict on checking and changing of filters. I agree, a whole house system can make for major issues, but in our area, people are taught to check their humidifier filter/system as often as they check and change their furnace filter.

Thanks all for your advice. I'll reach out to the furnace installer. The humidifier was there when we bought the home 12 years ago.