I have hunted in HOT weather and I have NEVER let any meat go bad if I can help it(meaning I make a good shot and can recover fast things sometimes can happen to change this)
I personally went and bought some great bug suits for warm weather, Bug Tamer Plus II, I can wear shorts and a t shirt under it and it vents very nicely adds some camo, and keep biting bugs of me
I tend to walk in wearing as little as possible(like any added layers I just carry in)
to try and NOT break a sweat on walk in and will stop often to cool down if needed
deer eat and live 24/7 outside, so if your home it makes it a LOT harder to kill one, than hunting even in warm temps??
all about paying attention to details more in warm weather IMO!