The furnace filter needs to be changed
It time to change your air filter on your furnace
Your force air furnace needs to stay clean. The A Coil ( evaporator coil) needs to be free of debris so air can pass through allowing to cool or heat the house. If the coil gets clogged it is a very expensive to have clean, because the furnace in many cases needs to be remove to have access to the under side of the coil.
The pleaded filter that gets dirty make the blower fan work harder, which could shorten the life of the furnace. It could also affect the efficiency of the furnace. I recommend the fiberglass type filter
Pleaded Filter
Fiberglass Filter
The filter recommend every 30 days, I find every two to three months work if the house not that dusty.
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