@ Paul Ron
Come on... he lives in an apartment building the thermal inertia of the building could very well be what he says. Don't bust the OP's chops just to sound smart. I explained that in Aruba, even in a nice hotel the "cold" water was never below 90 degrees F!!
He might be on the 10th floor of a building where the pipes run with the heating pipes or on the south wall who knows, but he came to us with a legitimate question, that I am sure is experienced by more than him alone.