How often to replace hvac filter in an Airbnb

Every 60 days (~2 months). Cost: $15–$40. DIY-friendly.

The 60-day rule (and why most operators miss it)

The HVAC filter is the single cheapest piece of preventive maintenance in a short-term rental — and the one most operators forget about until a guest leaves a review mentioning “musty smell” or until the AC quits in July. A $20 filter, swapped on a 60-day cadence, prevents three different five-figure failures: blower motor burnout, evaporator coil freeze-up, and compressor strain that shortens the unit’s life by 5-7 years.

The reason it slips through the cracks is that nothing visibly bad happens on day 61. The filter looks dirty, the system runs slightly louder, and energy use creeps up 5-15%. By month four, airflow is restricted enough that the coil starts freezing on hot days. By month six, you have a service call. Most STR owners who tell us “the AC just died” are actually telling us “the filter has not been changed in eight months.”

Cadence that actually works

Sixty days is the right baseline for an STR. Long-term rentals can get away with 90 days, but STRs deal with two things long-term doesn’t: rotating cleaners (who do not own the property and will not notice a slow degradation) and rotating guests (who run the system at extreme settings, dragging in pet dander and outdoor pollen). If the property is in a high-pollen region, a wildfire-smoke region, or has shedding pets, drop to 45 days.

The rule of thumb: replace it every other deep clean, plus once at the start of cooling season and once at the start of heating season. That gives you 6 changes a year on a typical setup, costing $90-$240 in filter inventory.

DIY walk-through

This is one of the most DIY-friendly tasks on the entire maintenance list. The whole job takes three minutes once you know where the return is.

1. Locate the return-air vent. Usually the largest grille in the home, often in a hallway ceiling or near the thermostat. The filter sits behind that grille, or in a slot at the air handler in the closet/attic.
2. Note the filter dimensions. Write them on a label inside the supply closet so cleaners can replace it. Common STR sizes are 16x25x1, 20x25x1, and 16x20x1.
3. Buy in bulk. A 6-pack of MERV 8 filters runs about $30-50 on Amazon Subscribe & Save. MERV 8 is the sweet spot for STR — high enough to catch pet dander, low enough to not strain the blower.
4. Mark the airflow direction. Every filter has an arrow showing airflow direction. It points toward the air handler.
5. Date it. Sharpie the install date on the filter edge. Future-you (or future-cleaner) will thank you.

Hand-off to your cleaner

Most operators eventually delegate this to their turnover cleaner. To do that successfully:

• Stage 6-12 spare filters in a labeled bin in the supply closet
• Add “Replace HVAC filter” to the cleaner SOP, with a photo of the return location
• Pay an extra $5-10 per turn that includes a filter change, or just every other turn
• Audit by checking the install date written on the filter during your next visit

Signs you waited too long

• Visible gray dust caked across the filter face
• AC running but vents barely blowing
• Higher-than-normal electric bills (cooling cost 10-25% above same-month last year)
• Ice on the refrigerant line outside the air handler
• Guest complaints about the system “running constantly”

If any of those show up, change the filter immediately and watch the system for 24 hours. If the issue persists, you are looking at a service call — typically $150-400 for a coil cleaning or refrigerant top-off.

Related tools

• Maintenance schedule generator — schedule this every 60 days across all your properties at once
• Restock calculator — bake filter inventory into your monthly restock list
• Cleaner dispatch — add filter changes to the cleaner SOP

FAQ

Last verified 2026-05-08.