Try to Designate an Instrument Storage Closet or General Area
Where String Instruments Can Gather for Group Humidification
Use a Large Console or Room Humidifier
We speak from experience when testifying to the effectiveness of console humidifiers. After burning out the circuit boards of two different whole-shop humidifiers and figuring out the best commercial size humidifier able to keep up with the needs for our shop, we relied exclusively on large, thirteen gallon console humidifiers for our store.
Unlike the type of humidifier you may use in your bedroom at home (like those commonly sold at pharmacies), console humidifiers can hold many gallons of water in their reservoirs at a time.
Thirteen gallon console humidifiers like the ones we used are definitely pricier (starting around $175) than a Humitron, Stretto, or bedroom-sized humidifier, but their ability to provide enough, sustained humidity for entire days may end up saving your repair budget a LOT of money in the long run.
If a console humidifier is out of range for now, you could try out a couple of smaller room humidifiers--just make sure to keep up with refilling those reservoirs and don't leave anything running that could potentially "burn" out over weekends and breaks.

If you are Using a Console/Room Humidifier, Try Not to Store Instruments or Bows in Cases
- If you have a safe way to store the instruments outside of their cases (like cello and bass stands or custom, open shelving), keep instruments and bows out of their cases.
- If you are running a console/room humidifier, cases will essentially stop the humidity from reaching the instruments and you will be doing a lot of work for little to no result.
- However, if you have a mixed storage space (ie. open cello stands and shelves for violin cases), you may need to implement use of a console/room humidifier for your larger instruments and in-case/instrument humidifiers for instruments stored in cases.