I am thinking of controlling the humidifier mounted on my furnace. There is a humidistat in the cold air return duct that controls a 24VAC furnace signal to the humidifier. Basically, I want to replace the humidistat with a zwave or zigbee switch that would turn the humidifier on/off based on readings from a zwave humidity sensor in the living space. I am envisioning a battery operated open/closed (normally open) switch. The switch would be carrying the 24VAC signal. Is there a sensor ouot there that I can repurpose for this? Has anyone done this?
You could use an esp micro with STAnything.
I was planning on doing that but just haven’t gotten around to implementing it.
My Ecobee 3 thermostat does this perfectly without any extra effort. The only requirement is having the 2 wires from the humidifier running to the thermostat location. It also integrates with SmartThings, Alexa, etc.
No way to get wires to the thermostat wothout tearing out the drywall ceiling in the basement. I was hoping to be able to read the thermostat state (Honeywell RTH6500) with the ST app, and use it to control a smart plug. I can turn the thermostat on/off, etc. with the ST app, but it doesn’t report if it is in heating, cooling, etc.
So, my current throught is to use a Centralite humidity sensor and a NuTone Isolated Fixture Controller to control the humidifier. The way I envision it working is:
- Humifier power provided by the furnace (24VAC).
- The NuTone controller will turn on/off the controller, replacing the humidistat that is on the cold air return.
- The Centralite humidity sensor will drive a WebCore piston that turns on/off the humidifer (via the NuTone controller) based on the outside temperature (Accuweather smart app), furnace operating mode (heating only), and interior temperature.
The parts I am planning on buying are:
Anyone ever tried anything like this?