What “climate-controlled” means
Terms vary by provider. Temperature-controlled units are heated and/or cooled to stay within a range. Humidity-controlled units also limit moisture, which matters most for damp-sensitive items. In the UK and much of Europe, many indoor facilities are insulated and ventilated rather than fully climate-controlled. Always ask the provider exactly what they control and to what range.
Items that benefit from climate control
- Wooden and antique furniture, which can warp or crack
- Electronics, computers and musical instruments
- Paper documents, books and photographs
- Artwork, leather, fabrics and mattresses
- Wine and some collectibles
- Medicines and cosmetics (check the facility allows them)
When a standard unit is fine
- Short stays in a mild season
- Garden furniture, tools and bikes
- Plastic storage boxes of clothes or kitchenware
- Items you’d happily keep in a garage
Protect your things in any unit
- Use plastic crates or good-quality boxes, not bin bags
- Keep items off the floor on pallets
- Leave a gap between items and walls for airflow
- Cover furniture with breathable dust sheets, not plastic wrap
- Make sure everything is completely dry before storing
Last updated: 13 October 2026
