Every year around the equinox, we get the same run of questions on the member line: why did the rind on a wheel that was behaving all summer suddenly go tacky, or dry out, or start throwing a patch of unwanted mold. The answer is almost never the cheese. It's the air outside the cave changing faster than the air inside it. This year's fall equinox landed in the last week of September, right on schedule, and the calls started arriving within days.
Outdoor humidity swings harder in late September than in almost any other month — cooler nights, warmer days, and depending on where you are, the first real rain in weeks. If your cave takes its makeup air from outside, or your humidification system was tuned to August's numbers, this is exactly the week those settings stop matching reality. A room that held 85 percent relative humidity without complaint all summer can drift five or ten points in either direction once the outside air it's exchanging with has changed character.
What to check before you touch the dial
Our Humidity & Airflow Control course walks new cave managers through a sequence we still think holds up for anyone, seasoned or not: read the cave before you read the equipment. Log actual humidity and temperature at rind height, not just at the sensor, for a few days running. Wheels near a door or a vent will tell you a different story than wheels in the middle of a rack, and the difference tends to widen right around now, when the gap between outdoor and indoor conditions is at its widest all year.
Only after you've got a few real readings should you touch the humidifier or the vents — and change one variable at a time. A cave that's drifted for two weeks doesn't need a two-week correction in one afternoon; a sudden swing the other direction just trades one stress for another. Several members in past cohorts have told us the instinct to overcorrect is the hardest one to unlearn, especially on a wheel you're worried about. Small, dated adjustments you can trace back to a specific reading beat a big one you're guessing at.
The washed-rind problem specifically
If you're running washed-rind styles, this is also the point in the year where wash schedules that worked all summer start producing uneven color and patchy smear. A slightly damper cave means your rind is already holding more moisture before you ever pick up the brine cloth, so a wash frequency that was right in July can be one too many in late September. The fix usually isn't a different brine — it's a day or two more between washes until the rind tells you otherwise. The same logic runs the other way for a cave that's gone drier than expected: a rind that's taking on cracks at the edges wants a shorter interval and a lighter hand, not a stronger solution.
None of this is a one-size answer, which is exactly why the course runs cohorts rather than a single video: airflow and humidity behave differently in a converted barn than in a purpose-built room, and a lot of what members get out of it is comparing notes with someone whose cave is shaped like theirs. If your cave has felt off this week and you can't put your finger on why, start with the readings, not the dial — and if you want company while you sort it out, the next Humidity & Airflow Control cohort is open for enrollment through the education portal.
The International Cheese Federation (ICF) and More Cheese are entirely fictional. This post is demonstration content created for MemberJunction. All people, organizations, events, courses, certifications, figures, and quotations in it are invented, and nothing here represents a real association, a real business, a real person, or real professional advice.