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TORONTO – If you’re like most people, you probably don’t give your furnace much thought as long as it’s keeping you warm in the winter and cool in the summer. But in order to keep it working to its ...

The main job of a furnace filter is to keep big stuff from getting in to the furnace heat exchanger or the air conditioner air coil and clogging things up with dust, pet hair, Barbie doll heads, and ...