I owned a humidifier with a relay switch as described here, but the problem
was that the heater still didn't run long enough at one time to disburse
enough humidity to make the humidifier worthwhile. Before engineering a
clever on-off system, take some measurements of the average run time of your
blower on an average cold day (very difficult to do), and decide if that's
enough. At my house, running a hunidifier 30% of the time would be like not
having one. Then I got a standlone humidifier in my bedroom where I really
needed it, and that's another subject. It works best in a small area, so I
have to keep the bedroom and bathroom doors closed.
-B

"nospamplease" wrote in message
...
I bought the AirKing rotating drum type humidifier from home depot and
installed it on my furnace today, however, something I found it's very
stupid by design. I set the % humidity to my desired percentage. However,
the humidifier is on even the heat is not on, the drum keeps rotating all
the time. It's waste of my electricity.

Is it possible to install a device that detects air flow, then turns it
on??
is there such as device? Help... please..