You (generalizing here, not pointing fingers) want to OC because it's too hot? You're a pussy. Yes, that's what I said....you.....are....a....pussy.
I just got home and it's 92 degrees today, with 75% humidity. This hasn't actually been a terribly hot summer for Kansas, although it's lasting a bit longer than usual. I've spent time outdoors when it was 100 degrees in the shade, wearing what I did today: a pair of cotton trousers an untucked lightweight shirt, with a pair of Van's. I wasn't any more, or less, comfortable than I would have been wearing cargo shorts and a t-shirt. Perhaps more so, since I didn't have the sun beating down on large portions of my exposed skin. My carry gun? A Beretta 92, as it has been for the last five years, 365. Carried IWB in other areas of the country that make this place look like Alaska in February.
Glen's right, there's no way to be comfortable in high summer no matter what you wear. OCing your gatt isn't going to improve your comfort level. In truth, carrying a gun isn't comfortable, period. After doing it for thirty years and in all manners of carry, all I can say is this: it's a general pain in the ass. If comfort is your primary concern, forget OC, IWB or any other carry method. Just leave the gun at home and invest in Gold Bond powder and Egyptian cotton underwear with a thousand thread count. That will be of more benefit to the collective than having one more OCing d-bag out there.