On Oct 23, 8:02*pm, "James" no wrote:
Clare, these are good points, except that we tried the ultrasonic units
years ago, and they made no difference whatsoever.

I am now wondering if I *shouldn't simply install some sort of vent-pipe
through the wall. * Just the smallest amount of fresh air from the outside
would cure this problem, I am quite sure. *Perhaps a six inch pvc pipe, with
a mesh screen to defeat animal (more mice!) *entry....

I bet there is something on the market that would work, I will look
around....

James

Dryer vent hoses are 4". What about using a louvered door insert
between the bathroom and the bedroom? We did that for additional
ventilation in our bathroom because we didn't want to keep the window
open and didn't want to put in a ceiling or wall fan.