I had a inspection yesterday for a client and was checking the heating system and ducts, the home owner was there and i had asked when was the last time the unit was serviced after not seeing any evidence of prior servicing dates on the exterior of unit. His response was " we have never had a problem and i dont believe it has been serviced" as it turned out the filters where so clogged with debris that they caved in to the pressure of the intake making the unit work "overtime" trying get enough combustion air to heat the home. Just a reminder to not forget about changing filters in your furnace regularly ( i do mine every three months to maximize air flow and not restrict my system) and its just good money spent to keep clean air throghout your home.
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