i have cold water in the ground, but once it gets to the roof pipes it heats up fast in the summer. we’ve got them insulated but not insulated enough. i keep arguing with the landlord to let me go up there and put some pool noodles around them. so if you’re in the part of the house that gets its water from roof pipes, in the summer sometimes the hot water comes out colder than the cold (that pipe already has a pool noodle around it don’t get me started)