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HVAC SystemsUpdated February 11, 20260 views0 found helpful

HVAC Filter Guide: Types, Sizes, and How Often to Change

Everything you need to know about HVAC filters — which type to buy, how to find your size, and the ideal replacement schedule.

HVACfiltersmaintenanceair qualityMERV rating

Why HVAC Filters Matter

Your HVAC filter is the first line of defense for both your equipment and your indoor air quality. A dirty filter restricts airflow, forcing your system to work harder.

Filter Types Compared

Fiberglass (MERV 1–4)

  • Cost: $1–$5
  • Change every: 30 days

Pleated (MERV 8–13)

  • Cost: $5–$25
  • Change every: 60–90 days
  • Good balance of filtration and airflow

HEPA-Style (MERV 14–16)

  • Cost: $20–$50
  • Change every: 90 days

Replacement Schedule

Filter TypeRecommended Interval
1" FiberglassEvery 30 days
1" PleatedEvery 60–90 days
2" PleatedEvery 3–4 months
4" PleatedEvery 6–12 months

Pro Tips

  • Set a calendar reminder for filter checks
  • Buy in bulk — Filters are cheaper in multi-packs
  • Check the arrow — The arrow on the filter frame points toward the blower/furnace

Questions about your HVAC system? Call Radiant Technology at (845) 800-9119 or submit a ticket [blocked].

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