Store wine at roughly 55 degrees with relative humidity between 55 and 75 percent. But the target number matters less than stability — a steady 58 degrees is far better for a collection than a room that swings between 52 and 64.

Temperature

Fifty-five degrees is the traditional cellar temperature and remains the standard. Anywhere in the mid-fifties is fine.

Warmer accelerates aging. Wine kept in the seventies matures far faster than intended, and the results are usually not what the winemaker had in mind — fruit fades and the wine can take on a cooked character.

Colder slows aging, which is not harmful in itself, but below about 45 degrees you risk tartrate crystals forming and, at freezing, expansion pushing the cork out.

Stability Matters More Than the Number

This is the part that actually damages collections, and it is the reason a wine room needs dedicated equipment rather than a spare closet.

Every temperature swing expands and contracts the wine in the bottle. That movement works the cork loose over time and draws air past it, and oxidation is what ruins a bottle.

A room holding a steady 58 degrees will preserve wine better than one averaging 55 while cycling several degrees each day. Slow seasonal drift is tolerable; daily swings are not.

This is why a wine room cooling system is specified differently from comfort equipment — it is built to hold a narrow band continuously rather than to cool a space down quickly.

Humidity

Between 55 and 75 percent, with around 60 to 70 percent as the comfortable middle.

Too dry and corks shrink, which lets air in and allows wine to seep out. Below about 50 percent sustained, that becomes a real risk for long-term storage.

Too humid and the wine is fine, but labels and cardboard cases deteriorate, and above roughly 80 percent mould develops on corks, labels, and racking.

In a Hill Country summer, ambient humidity is high enough that the usual problem is keeping it down rather than up. In winter, heated air can dry a room out.

Light and Vibration

Two more factors that belong in the same conversation.

Ultraviolet light degrades wine, which is why bottles are tinted. Keep the room dark, use LED lighting that produces little heat, and avoid direct sun on any glass wall.

Vibration disturbs sediment and is thought to accelerate chemical reactions. Avoid mounting racking on a wall shared with laundry equipment or mechanical rooms, and choose cooling equipment that does not transmit vibration into the structure.

The Envelope Decides Whether the Equipment Can Cope

Most wine room complaints are building problems rather than equipment problems.

Inadequate insulation lets the room fight the surrounding house. A missing or improperly placed vapour barrier is worse — moisture migrating through the wall into a cooled space condenses inside the assembly, which causes mould and structural damage you cannot see.

Door seals matter enormously. A failing gasket makes the equipment run continuously while never quite holding conditions.

Glass walls need appropriate glazing, and they substantially increase the cooling load.

Heat Rejection

The cooling unit has to dump its heat somewhere. Self-contained units exhaust into an adjacent space, and if that space is a closet or an unventilated utility room, the unit overheats and loses capacity.

In a Hill Country August, a condenser located in a hot attic or a closed garage is fighting a losing battle.

Monitoring and Service

Keep an independent thermometer and hygrometer in the room rather than trusting the unit’s display, and consider a monitor with alerts so a failure reaches you in hours rather than after a weekend away.

Twice-yearly service keeps conditions where they belong, and it can be added to our Care Club maintenance plan alongside your other cooling equipment.

Contact 72 Degrees or call (830) 468-5316.