I use cold water on dark clothes with the adjustable temper valve set at 80F (as low as it goes). IMO, 80F seems a bit on the teetering edge of being a little too warm. I notices a bit of bleeding occurring in every cold wash before the spin occurs. 85F is too hot IMO, at least for a top loader anyway. Cold water washes should include liquid detergents only, IMO. Save the powder detergents for warm/hot washes.