Nest Thermostat with Humidifier


Old 05-10-15, 05:27 PM
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Nest Thermostat with Humidifier

Hey there, I replaced my old thermostat (an Emerson 1F95-1291) with a Nest thermostat. I've got everything working - including the humidifier (just putting it in the * plug) worked great - tested it and it runs. However, I'm uncertain if it should be run with heat or if it can just run with the fan.

How would I determine which is necessary? If it depends on the furnace, it's a Trane xv95.

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Old 05-11-15, 11:46 PM
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Before you had the Nest, what controlled your humidifier?

Before you connected it to the Nest when did it run?

Here is a link to the Nest Pro Installation Guide. On page 20 it explains the different options for configuring the humidifier output from the Nest.
Old 05-12-15, 12:41 AM
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Welcome to the forums.

I recommend to my customers to not run the humidifier with the fan only as the cool air doesn't transfer enough of the humidity to justify the expense.

However, that can change based on type of humidifier as some are designed to be used with cold air. A steam type humidifier is one type.
Old 05-14-15, 02:43 PM
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The old thermostat that controlled it before - wish I'd paid attention to when it ran!

I'll read through the pro guide and check which kind of humidifier I have. Thank you both!

EDIT: I have an Aprilaire Model 400M humidifier - in the FAQ it says it shouldn't need the heat to go on because it's evaporative - just the fan.

Hope that helps someone else, and feel free to correct me if I'm making a horrible mistake

Last edited by jkmssel; 05-14-15 at 03:00 PM. Reason: giving it a try without the heat
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