In my lifetime of drilling I drilled 1 well that blew air. It was in South Georgia. It blew enough air at about 60 degrees to cool a camp cabin. However it produced a damp musty air because it was coming from an underground cave. The well did produce water as well.
I drilled another well some 60 miles away and it sucked air. Sometimes it sucked more air than at other times.
Were they related. . . who knows?