i have been contemplating this if we had the summer people were saying we would....
i have two long hairs a father and son, Polo and Hugo....turns out Hugo decided to get mites a few months back...hair fell out...and is only just growing back now..so i guess he kinda solved the problem for me...
As for Polo...some of his fur is trimmed anyway as he has a large cist on his bottom, that occasionally splits and leaks...he has had it treated but the vet doesnt want to remove it (at its peak is was the size of a gobstopper :o )
I havnt trimmed Polo, instead i have just given him a frozen bottle (coke bottle filled with frozen water) and put his run under a tree for shade. that said he doesnt really seem to be feeling the heat!
The two who are feeling the eat are the oldest two, Capuchino and Cinnamon (my romantic love birds, Cinnamon was damaged after a bad pregnancy and cant have babies). So I did the same with them, frozen bottle and shade, they dont really have much fur so trimming isnt an option there. I also put a sheet over their runs that seems to cool them down...