We installed an HRV last winter for that same reason, windows so wet that on
very cold days, ice would form.
We had to chisel the ice off the bottom of the patio door in order to open
it on extreme cold day. (Canada)
The HRV works fine and has helped. BUT!!! the humidity is at 36% now and it
is only -7 Celcius outside which isn't very cold and the windows have
condensation at the bottom again.
I think our windows where either or both : very cheap and poorly installed.
"Stretch" wrote in message
oups.com...
Pete, the ideal RH for you may be higher than the ideal Relative
Humidity for your windows. It depends on the windows, how cold it is
outside, how warm it is inside, how your house is constructed and the
people who live there. It can't really be answered over the internet.
Most people would prefer 35 to 45% RH. The windows may sweat under
those conditions.

Stretch