Quote:
Originally Posted by berry1234
Can you explain how the whistle sounds and when it is created? How much of a temp. change creates this condition?
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Does it in heat only, this will make it the worse….. Set air to blow out of floor and vents and the same time, fan ½ to ¾ speed, now adjust the temperature, starting with a low setting and then start to increase slowly one or two degrees at a time, and at a given point, when it calls for more hot air, the air ducts will start to whistle..