I recently moved into an older apt building (1930's) that has electric baseboard heat. The problematic one in the living room is a 12' that clicks very loudly. I understand that electric baseboard heaters do make some noise, but how much is normal? The 6' heater in the other room hardly makes any noise. Does size really matter? Also, I've had the heating element replaced with another from another unit in the building and am having the same noisy problem. HELP ME PLEASE.