To ensure your furnace runs its best, your coil needs to be clean. If your home has a split-unit air conditioner, you will find a coil inside your furnace either above or below your blower. Even though you may not be running your air conditioner, air from the blower still needs to pass through the coil to heat your home. If your coil is dirty, your blower will have to work harder and you will be getting less air into your ductwork.

Recommended Treatment:  Clean the dust from the coils by using Vacuum & High Air Pressure.