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@@Bizgirlva I don't know about the cold but I tested the hot and was amazed. I left it overnight on the counter with 190 degree water from my keurig in it. I think I actually checked it about thirteen hours later, maybe closer to 14 but the water was hot enough that i regretted sticking my finger in it. Still definitely hot. Absolutely hot enough to make tea in, if I stuck a bag in it.