If your furnace filter is clogged its energy efficiency is reduce and can eventually lead to expensive repairs. Its easy to forget when to complete this mundane task. With the help of the Furnace Filter Whistle you will know just when it is time to replace the filter, because it will whistle when the filter becomes 50% clogged. Now you can easily keep your heating and air conditioning system running efficiently without the hassle of remembering to change your filter.
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