On Sep 18, 5:44 pm, Chris Hodges wrote:
True (ish) but if you then have to vent warm air outside because it's
moist and then heat fresh air it can go the other way - don't forget
that as well as the waste heat (input power) you get the latent heat
from condesing the water.

I agree, what I meant is extra heat over and above the _total_ heat
derived from the dehumidifier.

I looked into the cost of dehumidifier vs ventilation and gas ch:

http://groups.google.com/group/uk.d-...se_frm/thread/
ec4b82e34aaf1e12/f101fc341cb4351a?lnk=st&q=%22pete+c
%22+dehumidifier&rnum=1#f101fc341cb4351a

So IMHO once the air humidity is below 65% it's reasonably likely to
be cheaper to use a dehumidifier, better control at least.

So a humidistatic kitchen/bathroom fan could be worth having but a
dehumidifer could well be cheaper than leaving windows open for too
long.

cheers,
Pete.