Air monitors are incredibly fussy

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Heat exhaustion, heat stroke, and such aren't modeled in SS13, where the only danger spacemen face from heat is literally searing the insides of their lungs. They're not really "stand there and take damage" conditions so much as they are "slowly sweat yourself into sickness and dehydration over the course of 30+ minutes", anyway. Maybe slow-progression diseases caused by being in a hot room with no water in your system?