The general rule is to change a furnace filter, which is usually located behind a return-air vent or in a slot on ... you’re likely to be using your air conditioner. A clean filter is necessary ...

You can maximize your air conditioner’s overall efficiency by replacing the filter regularly, cleaning the vents (including the vents on your wall-mounted unit if you have one), and inspecting ...

IT MIGHT BE A GOOD TIME TO CHANGE IT TOO, BECAUSE A DIRTY FILTER CAN PREVENT OPTIMAL AIRFLO A strange odor coming from your car’s air vents, especially when you turn on the air conditioner or ...