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    Furnace Filter Swap

    2-min DIY. Saves $$ + extends HVAC life.

    How often

    • 1" standard filters: every 1-3 months.
    • 4-5" pleated filters: every 6-12 months.
    • Pets/dust = more often.
    • Seasonal allergies = more often.
    • Set phone reminder.
    • Don't skip — kills HVAC.

    Steps (2 min)

    • Turn off HVAC.
    • Find filter slot (next to HVAC unit).
    • Note arrow direction on old filter.
    • Slide out old.
    • Slide in new (arrow same direction).
    • Turn HVAC back on.
    • Done.

    Find size

    • Written on side of OLD filter.
    • Common: 16x25, 20x25, 16x20.
    • Subscribe + Save Amazon — auto-deliver.
    • Costco bulk 6-12 pack cheap.
    • Set + forget.

    MERV rating

    • MERV 8 = standard, fine for most.
    • MERV 11 = better for allergies.
    • MERV 13 = highest catches viruses.
    • Higher MERV = more pressure on HVAC.
    • Don't use HEPA filters in HVAC — too restrictive.
    • 11-13 sweet spot for senior allergy/health.

    Big savings

    Skipping filter changes destroys HVAC = $5K-15K replace. New filter = $8-30. HVAC contractor charges $30-50 to swap. Total no-brainer DIY. 5 min monthly. Family member can do if you can't.