Crossword Genius

Be inconsistent, or what an HVAC unit can do (4,3,3,4)

Ross

I believe the answer is:

blow hot and cold

(Other definitions for blow hot and cold that I've seen before include "Be inconsistent" , "Be unable to decide" , "Unpredictably, swing" , "Haver" , "as will the sirocco and mistral?" .)

I've seen this clue in the Universal.
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