Costs have gone up, record heat as well. Also depends on efficiency of
unit, insulation of home and other things. If you have original builder
grade, they tend out in minimum size which will run more to try and keep
up.
The hot air at first is normal. It’s the air that has been in the ducts
in your attic getting heated until the AC turns on and blows it out.
Should only last a short period.
