How to use this calendar
FilterCycle tracks three signals before we recommend a swap date:
- Static pressure rise at the filter grille (furnace working harder).
- Calendar age versus manufacturer marketing (often too aggressive).
- Household load — pets, pollen zone, renovation dust.
| System | Marketing says | FilterCycle typical range | Swap early if… |
|---|---|---|---|
| 1” pleated HVAC (MERV 11–13) | 90 days | 60–120 days | Pressure drop >0.5 in. w.c. or visible gray mat |
| 4” media cabinet | 6–12 months | 9–14 months | Allergy season + pets |
| Fridge water filter | 6 months | 6–9 months | Flow slows or taste changes |
| Portable HEPA | 3–6 months | 6–12 months | VOC pre-filter looks loaded |
Furnace filters (1” slot)
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Suburban home, one dog, MERV 11: plan on 75–90 days during shoulder seasons; 60 days during peak pollen.
Rural gravel driveway, MERV 13: 45–60 days is normal — not because MERV 13 “expires faster,” but because the media loads faster.
Subscription trap: Auto-ship every 30 days on a 16×25×1 pleated filter usually means 2–3× overspend unless you run the fan 24/7 in a commercial space.
Refrigerator cartridges
Most OEM cartridges are rated 6 months / 200 gallons. In practice:
- Light use (2 people, city water): 9 months is often fine if flow and taste stay normal.
- Heavy ice + water dispenser: stick to 6 months.
Always keep the OEM part number crosswalk handy — see our MERV guide for furnace picks and fridge SKU notes in product reviews.
What we log in test homes
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We photograph the filter face monthly, log pressure drop, and note fan runtime hours. Published intervals are the median of three homes (dusty rural, suburban pets, urban apartment). Your home may sit at the edge of the range — use pressure and visibility, not just the calendar.
Next: compare MERV 11 vs MERV 13 for allergies or audit your filter subscription.
