Maybe check with a neighbor or a yard hydrant, somewhere apart from your house. If the water is warm there, there’s probably nothing you can do about it. If it’s cool there, you almost certainly have a cross connection (between H&C) in your house. The water heater is a cross connection, supposed to be. Feel the pipe entering the WH a couple of feet away, is it warm? Do you have any handheld shower sprays with the mixing valve open and turned off at the spray? If there is a mixing valve (tubs & showers, but most any faucet can do it) open with something stopping the water after the valve, that’s a common cause.This started today. Getting warm (80°) water out of my cold water faucets. Hot water is 120°. House has crawl space. During hot months (90’s) the crawl space temp is in the 80’s and cold water is cool, definitely not warm. Today is the first cool day in ages and crawl space temp is high 70’s, but cold water is coming out warmer than normal. This is at all faucets, upstairs and down.
Any ideas/suggestions?