Whether a whistling noise is a serious problem depends entirely on its underlying source and whether it originates from mechanical equipment or aerodynamic air movement. If the whistling is caused by a dirty air filter, an unsealed door draft, or a slightly open supply register, it is a minor issue that you can easily resolve yourself by replacing the filter, applying weatherstripping, or opening your room vents. However, if the high-pitched whistling or whining sound originates from failing, unlubricated motor bearings inside your furnace or a gas leak hissing through a restricted pipe fitting, it can indicate a serious, potentially dangerous mechanical or safety failure that requires immediate professional attention to prevent a breakdown or hazard.
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