Answers from contractors near Greenville, South Carolina
I just change my water heater, it is 50 gallons big, the thermostat is on letter "c" one level less that very hot. Why water gets cold in the middle of shower?
I would recommend not less than 40 degrees. If the shingles are a dark color in direct sunlight they will seal in one day from the solar radiance from the sun even if temps are low.