--- title: "Wine Cellar Humidity Too Low: Causes and Fixes" description: "Wine cellar humidity too low shows up on a hygrometer reading under 50 %, in capsules that feel papery, in labels curling at the edges, and after years in a…" url: "https://winecellarrepair.center/problems/cellar-humidity-too-low/" --- # Wine Cellar Humidity Too Low Wine cellar humidity too low shows up on a hygrometer reading under 50 %, in capsules that feel papery, in labels curling at the edges, and after years in a faint fill line dropping in the neck of older bottles. ## What it usually means. A cellar is kept at roughly 50 to 70 % relative humidity so corks stay supple and do not let air in. A cooling unit dries the air as a side effect of cooling it, because moisture condenses on the cold coil and leaves by the drain. A unit that runs very long hours, whether because it is undersized, the room leaks heat or the exhaust side is too hot, wrings the room drier than it should. So does a coil running much colder than intended. The room plays its part: a cellar that exchanges air with a heated house in winter pulls in dry air through every gap at the door and around wiring. Some systems include a humidifier or a humidity control that has stopped working. Low humidity damages nothing in a day, but over months it shrinks corks, and that is why it deserves attention before the fill lines move. The 4 causes, cheapest first Answer these first 01 What does a hygrometer on a middle rack read, compared with the cellar's temperature? 02 Does the unit run nearly all the time? 03 Is the problem worse in winter, when the house heating is on? 04 Does the cellar door have a full weatherstrip and a threshold sweep? 05 Does your system include a humidifier or a humidity setting on the controller? ## Check these before you book. Wine cellar humidity too low: 5 checks, and none of them costs anything. 01 Put a hygrometer on a middle rack and read it at the same time each day for a few days. 02 Look at the cellar door: a full weatherstrip on three sides and a sweep or threshold at the floor. 03 Note how many hours a day the unit seems to run, and whether the problem is worse in winter. ### Also worth checking - As a stopgap, a shallow tray of water in the cellar can raise the reading a little; keep it away from outlets and the unit. - Tell us the make, the model number and whether your system includes a humidifier. ### How soon does it need a visit? Not urgent. Low humidity works over months. Book when convenient, and fix any gap at the door first. ## The causes, cheapest first. 4 things wine cellar humidity too low turns out to be, from dry house air getting past the door to unit running too long and over-drying the air. [The cost guide](https://winecellarrepair.center/cost/) 1. 01 low ### Dry house air getting past the door A door with no weatherstrip or a gap at the floor lets heated, dry house air flow in all winter. Sealing it is often the cheapest fix a cellar ever gets. [Fixed by cellar cooling load and room check](https://winecellarrepair.center/services/cellar-cooling-load-and-room-check/) 2. 02 low to moderate ### Coil running too cold A coil far below the dew point strips water hard. A low refrigerant charge or a slow fan can make it run colder than designed. [Fixed by cellar evaporator and condenser fan repair](https://winecellarrepair.center/services/cellar-evaporator-and-condenser-fan-repair/) 3. 03 low to moderate ### Humidifier or humidity control not working Where a system includes humidity control, a dry reservoir, a scaled pad or a failed humidity sensor lets the room drift dry. [Fixed by cellar humidity control repair](https://winecellarrepair.center/services/cellar-humidity-control-repair/) 4. 04 varies ### Unit running too long and over-drying the air Every hour of running pulls more water out of the air. A unit that barely rests, because the room gains heat faster than it should, leaves the air dry as well as the room warm. [Fixed by cellar cooling load and room check](https://winecellarrepair.center/services/cellar-cooling-load-and-room-check/) [See cellar cooling unit running constantly](https://winecellarrepair.center/problems/cellar-unit-running-constantly/) 5. What it costs ### Every repair on the site's cost scale, side by side Open the cost guide ## What else it could be. Most often confused with cellar cooling unit running constantly, then wine cellar humidity too high or mold. [All problems](https://winecellarrepair.center/problems/) Codes that come with it - [`Flashing humidity with (!) below the low limit` Wine Guardian · Humidity](https://winecellarrepair.center/error-codes/wine-guardian-low-humidity-alarm/) Also related - [**Cellar Cooling Evaporator Coil Icing Up** 5 causes](https://winecellarrepair.center/problems/evaporator-coil-icing-up/) ### Cellar Cooling Unit Running Constantly 5 causes ### Wine Cellar Humidity Too High or Mold 5 causes ### Wine Cellar Too Cold 4 causes ## The makes it happens on. 7 makes on this site; wine cellar humidity too low can show up on any of them. Each mark opens that make's own page. [All 7 brands](https://winecellarrepair.center/brands/) ## Wine Cellar Humidity Too Low, where we come out. 9 metros, each with its own page. 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Roughly 50 to 70 %. Below that, corks slowly dry; above it, labels and wood suffer and mold can start. Steadiness matters as much as the number. ### Can a cellar cooling unit add humidity? Most cannot; they only remove it. Some systems pair the cooling unit with a humidifier, and some controllers limit how dry the air gets by changing how the fan runs. Your model number tells us which you have. ### Is low humidity worse with a split system than a through-the-wall unit? Not by nature. What drives it is how long the unit runs and how cold its coil is. A well-sized system of either kind, in a sealed room, keeps humidity in a good band. ### Do dry corks really let wine spoil? Over years, yes. A cork that shrinks lets a little air in and a little wine out, and the fill level in the neck drops. It is slow, which is why fixing low humidity is maintenance rather than an emergency. --- **[Read on the site: Wine Cellar Humidity Too Low: Causes and Fixes](https://winecellarrepair.center/problems/cellar-humidity-too-low/)** **[Book a visit with WineCellarRepair.center](https://winecellarrepair.center/schedule/)**