I've been on Losartan over six years and HCTZ, diuretic the past five. Don't have a problem with the heat unless it's a screaming, unrelenting blast furnace and even with the diuretic, this just means drinking water and fluids before I head out and regular intake of water or electrolytes during... and after the ride. Usually, my recovery drink is a beer, Coors Banquet or an IPA mixed with organic Lemonade over ice. I think the Australians call this a Shandy.