I'm shopping for a crawlspace dehumidifier and come across units that claim
to work under low temperature, as well as units that do not mention anything
about low temperature.
Are low-temperature dehumidifiers constructed differently than non
low-temperature dehumidifier, or is it just hype?
I don't know the differance, but many regular dehumidifiers only operate to
about 70 deg. The one my basement would freeze over when it got much below
The low temperature ones operate down to around 45 deg. Some may operate
slightly higher or lower.
I believe the true low temp units sense when the evaporator coils ice
up and enter a defrost cycle. You can do an active defrost (more
expensive but faster) or passive (just shut off the compressor while
keeping the fan running to melt the ice; cheap but slow) It's likely
the design is also tuned to reduce the tendency to ice up, probably at
the expense of dehumidification capacity.
Just a comment.
Our very ordinary dehumidifier does not have any de-frosting features
and does have tendency when operated in our cool basement and set 'too
aggressively' to ice up.
At this time of the year, where here in North America it is winter, it
doesn't operate very much anyway because the air is dryer in cold
One modification am thinking of making is to have the fan run all the
time it is plugged in.
So if it does ice up the contnuous air flow will melt the ice more
They work but what they actualy remove in cold air compared to the
rating and what your power consumption will be I think will suprise
you unhappily. Buy from a place you can return it after you verify
what it does and what it costs to run.
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