I too have a mini split AC but with a double car garage, it really doesn't do that well either. Lucky for us we do not have humidity here but the temperatures are among or topping temperatures anywhere else. Our tempts were up to 118, which is too hot for anyone. Just happy I am not a roof worker or any other outside job. I stay in air conditioning as much as I can. Even white cars are too hot to touch.
Dick
heppnerguy