Yikes! If you suddenly notice the unpleasant surprise of your cold air coming out of your vents, several things may be happening to your heater to cause this strange phenomenon all centered on a “RESTRICTION” theme. First, shut your heater and fan to the off position on your thermostat, because if your vents are blowing hot air, continuing to run your heater will only continue the problem. This post will explain what causes cold air to come out of the vents when you have your heater on, when warm air should be coming out instead.
Where do restrictions come from?
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