Quote:
Originally Posted by DoinItMyself  Just to confirm, you stating that it's OK to tap the same "R" and "C" connections on the furnace's control board to power both the thermostat and humidistat? |
Yes, it's OK, the power use is very little to run the display on the humidistat.
Quote:
| I spoke with an electrician and he thought it might be best to tap a new power source for the humidistat and leave the furnace control board alone. |
No need to worry about that. R and C as I said above takes very little power.
The W/G, and Cf is the one going to use a little bit more power since that powers up the water valve on the humidifier. and you have that on the transformer by itself.