It's common practice in the HVAC trade to blow condensor coils out with
filtered air to clean out loose debris, etc., and then remove the air,
moisture, CO2, etc. with a good vacuum pump. With a 29.5 + inch or better
vacuum level at a 70 deg F temperature the moisture will turn to vapor and
it will be pumped out. Sometimes, if they want it even better than that,
they perform a second step which involves adding a sweep charge of
refrigerant gas of the type that will eventually be used in the system, and
then pumping it out to the same vacuum level. This sweep charge is so dry
that it scavenges even a slight trace of remaining moisture so it can be
removed. You shouldn't need any heating equipment unless the temperature is
significantly colder than 70 deg. F. but you will need a good vacuum pump.
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