I did answer your question. Look around yourself at all the people that work outside for a living in temperatures much hotter than 79 degrees. Or think about all of human history before the advent of the air conditioner. Or the large segments of the global population that live in tropical climates without AC.
The fact that you become dehydrated “quickly” in 79 degree weather honestly might be a medical condition. Were I you, I would consult your doctor. Unless you’re fairly obese, the fact you’re saying you sweat so much you become dehydrated in mildly warm weather is concerning.
Oh, honey.