Well, I am old enough to remember when they used oil-burning smudge pots in the orchards on nights of frost protection.....it would make the orchards one heck of an eery smoky mess but nowadays our sense of social consciousness makes that one an unpopular option and you aren't likely to see anyone do that.
Some orchards use windmills in certain areas where cold temperatures accumulate in a cold sinkhole in order to fan out the super-cold spots.
What seems to be more likely to be recommended now, though, and especially for the homeowner, is to provide a sprinkling of water on the tree just before the freezing takes place......google "orchard sprinkling frost protection" and see what you get in the way of some links that can provide info on this. I have not tried sprinkling trees for protection and thus can not speak from direct experience. Maybe someone else can speak up who has had success.
What I know is that it has to be done right, it only works for certain types of cold (not prolonged sub-freezing nights and mornings), and seems to work paradoxically by the heat that is RELEASED to the blossoms by the chemical reaction of water turning to ice. So that actually in certain cases you want to artificially create ice on the tree to protect the blossoms.
I know that sounds risky.....maybe it is......but I am sure it works for the person who knows how to do it.