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First things to check are filters blower and coil.You can check filter and blower wheel by removing furnace panel. Coil will depend on heater you have a gas heater or electric as to how easy it is to access.
It is very possible you could need a new unit.These units usually last 15 to 17 years so it is way overdue to be replaced.
I would have an honest reliable heat and ac contractor take a look and see if servicing and a good cleaning may prolong the life, but sincerely ***** ***** not be very efficient even if working well.
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