Maybe down, but not out bossman...
I am starting to have more and more issues with the heat as I am getting older, Passed out once from the heat in AZ. Got more sensitive after that.
Note that I DO NOT live in AZ any more, nor will I ever live in that kind of climate any more.
California is close though. Nights are cooler here though even when it gets hot.
Mornings are tolerable. Nice thing about running my own show, is I go home if it gets too hot, Tomorrow is another day. Clients prefer I work safe than not.
I could not work in your humid summer Butch. There was a time I could. Not any more. Maybe just have something else to do in summer and then trees once it cools off. Maybe look for a foreman job at a company that checks line clearance or what not. ACRT is always hiring out here. Most those guys just drive around and make lists for the tree companies to follow to keep cutting. Granted they have to hike all over the place once the truck is parked, But you already use a tread mill anyway. You are in shape for it.