..

Refrigerant systems are designed to operate over particular
temperature ranges, and domestic appliances are not designed to
operate at outdoor temperatures. Outdoor aircon units have things
like compressor heaters to prevent the lubrication from waxing
up when it gets cold and the compressor may only be called upon
to operate very infrequently.
--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]


That's not the reason for crankcase heaters..


Cheers

Richard