Hot water is more expensive?
Seriously, though, with most modern detergents, there’s no difference. Hot water will tend to felt up knits and woolens a lot faster than cold, which is great if you want a felted aran sweater for your dog but not so great if you wanted to wear it yourself. Hot water will also set most stains that are of bodily fluid origin (= that stain is staying for good), whereas cold water will let you remove them.
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