Most of the heat generated by a clothes dryer is used to evaporate the water
contained in the clothes - to get it back, you'd have to condense the vapor
back to liquid water. Such machines exist - they're called condensing
dryers. They're not cheap.
If you just direct the vent from a normal dryer inside, the amount of
humidity is the same as you'd get if you hung the clothes up to dry inside,
though it probably gets dumped into the room in a shorter amount of time.
I'd worry more about lint - breathing it in.
I've used the nylon stocking trick also - but they are harder to find
these days!
I guess what I need is a way to measure the humidity remotely.
Seems to me that additional humididty is not a bad thing in the winter.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I'd tend to agree with that about humidity - can't see why anyone would want
to recover dryer heat in the summer.
The nylon stocking trick catches a lot of lint, but far from all of it. I
think you need something with a tighter weave to do a good job.