Furnace Filter Dirty
Dirt and debris has accumulated on the furnace filter.
Less commonFix nowHeating equipment
Why it matters
A dirty or blocked filter will restrict airflow and weaken the system's ability to heat the home sufficiently.
How common is it?
Found in 1% of the homes HomeCloud evaluated, Sep 2025 to Oct 2026.
Counted by the finding's name on HomeCloud reports, so the true number can be a little higher.
How soon to fix it
HomeCloud reports list this as a fix-now item.
More HVAC resources
What kind of HVAC system do I have?How to tell a heat pump from a gas furnace with AC, a packaged unit or a mini-split, and how to read the equipment label for its size and age.The best HVAC brandsWho makes the major brands, how to compare equipment fairly, and why the installer matters as much as the brand.HVAC maintenanceWhat you can do yourself (filters, the outdoor unit, the condensate line) and what a yearly tune-up covers.
Get it fixed
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