Hi,
if you use ambient air for heating you are wasting a lot of cold that should be used to cool down the air to be liquefied.
So change your system design.
As the cooling down will need previous drying of air (have a look on absorption dryers) your problem will evaporate.
If still you stick with the original design please clarify why this waste of energy is making sense.
If ok, then I have some ideas what to do.
RHABE
