These parts go into every cellar type above, and each one affects how hard the cooling has to work.
Custom wine racking
Wine Enthusiast, which sells racks, credits redwood heartwood with resisting rot, mildew and insects and describes mahogany as dense, slow to warp and free of a characteristic odor; it calls pine less stable and warns that pine and cedar can give off odors. Stain, if used, should be water-based so solvent smells stay away from corks. A layout can combine single-bottle slots, diamond bins and label-forward metal rows, and format changes what a bin holds: a retailer’s listing gives the same diamond bin as 9 magnums or 16 standard bottles.
Cellar doors and glass fronts
CellarPro’s reference table rates a 1-3/4-inch solid-core wood door near R-3.0, a hollow-core door near R-2.2, and double-pane low-E glass with a half-inch gap about R-3.1. Material aside, WhisperKOOL wants the jamb weatherstripped on every side, plus a sweep or threshold at the bottom, and says a door that leaks can leave the unit running without a break.
Cellar lighting
Wine Spectator warns that UV light can prematurely age wine, and darkness protects it best. A 2026 OENO One study found amber-filtered LED caused far less light-strike damage in white wine in clear bottles than cool-white light. We plan warm LED on a timer or motion sensor, surface-mounted rather than recessed, because recessed cans let house air leak into the cellar.