Cool definition
Most modern machines actually discourage the use of tap cold IMO.
Most digital interfaces try to make you use cold (basically controlled cold) over plain tap cold.
That's the one thing ATC has going for it: You do get the same water temp every time, regardless of what the connection is.
Temp wise, 90-100F is basically the go to for most any washing.
Best for enzymes, good enough for tensides.
For bleaching and hygiene, higher temps are better, but not needed for much more.
I do think though that many target temps for Normal cycles at least isn't really that optimal.
Quoting the famous Samsung manual line, their warm is swimming pool water, their hot is bath water temp.
That is vague, but guestimating is possible.
Hot should be right around 95F, warm anywhere between 70 and 85F.
Given that, I would guess controlled cold is aimed at 60F.
And I'd dare to say most other brands aim at the same temps.
With the typical 4 or 5 temp settings excluding tap cold, a not unreasonable shorthand might be - for the energy label cycle at least - 100F down in 10F steps.
So 100-90-80-70-60 or 100-85-70-55 or such.
Funny enough, Whirlpool just ditched most temp labeling a couple of years ago.
They just label hot and cold on either end, and give you like 6 or so LEDs to select from.
Possible they even just eliminated tap cold on the FLs, but not sure about that.
