I added Kasco surface aerator after a partial fsih kill last summer - ran 24/7 - may turn it off this weekend with this cold front. No more fish kills for me.
I am a belt and suspenders guy..

IMO, overcrowding causes more problems than our Texas heat - our 2 acre pond shrank to 1 acre and too many fish and not enough water - I push the evelope on numbers of HSB.
Never had a fish kill in 1/4 acre with NO aeration but control numbers to prevent overcrowding.