Google for "dryer+vent+valve"
(Amazon.com product link shortened)
When you start the dryer, you flip a lever and the dryer exhaust enters the
room instead of being wasted outside. This has two advantages: You get the
heat, you get the humidity.
On the down side, you'll have to put up with all the folks who will say
"You're gonna die a horrible death, covered with fungating pustules and
dripping sores!", particulrly if you have a gas dryer.
As for being inconsequential, not so. Thirty minutes of drying time will
turn your utility room and anything nearby into a plenty-toasty territority,
plus you'll be helping to save the planet.
Been doing this for 30 years with an
electric dryer. The heat and humidity
are welcome. The lint is another story.
In the basement it was not a problem.
However, in a home with the dryer in the
living quarters, you might want to
do as this person says, filter the air
to remove lint. But, you have to clean it
after every use, just like the filter in
the dryer itself.
Gas vs Electric dryers are two different stories. Electrics can vent
indoors with only the lint problem, we have been doing this for the 51
years we have been married. But gas presents a problem with the fumes
and humidity combined. If it were my situation, I would just place a
fan near the exhaust piping and blow air over the piping and recover a
little bit of heat that way, but at a negligible cost.
One of my DIYer friends down in Ga. mounted a gutted out service panel
on the wall above his dryer. Normally the air flows from the bottom
back of the box through an HVAC filter to the front of the box and out
the top to the vent.To dump the warm humid air into the house he just
opens the door on it. I don't know if or how he provided for keeping
the cold air from coming down the vent.
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