forces you have
you have muscular energy
and
you have (for lack of better term) water/cellular energy
when you are exercising, not in an a/c environment or away from a fan your muscles are much weaker, you lose salts and potassium much faster if the environment is not controlled. You lose "water/cellular energy" at a rapid rate causing muscles to fail prematurely
yes the workout is harder , say if your wearing a sweatshirt and jogging pants in 90 degree weather doing sprints, . sure thats a great workout, and would be good to try now an then but this is 'wasting' cellular energy (your losing more minerals and not taxing your muscles as hard as they can be taxed, because your muscles cant contract as hard as they possibly can without wc-energy
lack of this second type of energy 'cellular energy' sets you "muscular" workouts up for failure
becuase losing your minerals from c-energy at an excellerated rate causes muscle weakness and more instantaneous fatigue
the best way to exercise for fatloss and NOT water loss of (dehydration cosmetic manipulation causing a fatloss illusion) is to workout close to fan as hard as you can , staying hydrated but you wont have to worry as much because sweatin will be minimized. so all energy stores will stay stocked full except for calories witch eventually dwindle down after exercise leavin you fatigued in a different way
you wont be fatigued in a dehydrated way wich is almost undistiguishable from muscular fatigue, when working out in an "environmentally" controlled area
this becomes simple, once you are fatigued , not from sweating perfusley, but normal muscular fatigue just eat more and drink more water but dont liftweights outside where its hot as fuck and your wasting all your minerals fatigueing prematurely