Your furnace or AC is working extra hard because the filter is clogged. Like most everything else mechanical, lack of air flow reduces efficiency and causes enormous strain on your HVAC system.
Likely one of the most expensive systems in your entire house – your furnace is having its life substantially reduced.
Oh and, a clogged filter does nothing to improve the quality of the air you breathe. Dust mites, pet dander, pollen and many many more intruders are left on the prowl.
A certified ShelterHub Home Technician™ will inspect and clean and/or replace your filter on a rotating schedule to ensure that both you and your furnace can breathe easy.