Reddit reviews Arion In-Case Humidifier

There's not really any particular summer-time care regime for guitars. There are some basic rules of thumb that apply all year round, tho (some of which may be more or less applicable depending upon the time of year):

• You very definitely want to keep the guitar out of direct sunlight and should also try to avoid exposing it to rapid temperature and humidity changes. Keeping the guitar against a wall that's exposed to direct sunlight during part of the day is probably not a good idea even if no direct sunlight falls on the guitar.
  
• Dehydration is much worse than over-humidification, but over-humidification is bad, too!
  
• Guitars with solid woods are much more susceptible to humidity issues than guitars with laminated woods... but guitars with laminated woods are definitely NOT immune.
  
• Monitor the humidity of the rooms where you play and store the guitar. If the levels fall outside the level of humidity recommended by the manufacturer, take action to increase/decrease the humidity in those rooms or keep the guitar in its case. I personally use 45% +/-5% as my target; realistically +/-10% is probably acceptable. Caliber makes some really nice hygrometers that can be placed around the home and inside guitar cases.
  
• Rapid humidity changes are much worse than prolonged humidity changes. A friend of mine kept an acoustic mounted on a wall in his living-room which was right across from a bathroom. Every time someone took a prolonged shower in that room, the humidity level at the guitar would increase to 75% and then fall back down to 40% for the remainder of the day. THAT's not healthy for the guitar!
  
• There are a LOT of products that work well for bumping up the humidity level inside of guitar cases. Some of the 2-way humidification systems with the replaceable pouches work quite well, but often don't last very long and cen end up being expensive to maintain (but may be worth it depending upon the value of your guitar). A damp sponge inside a soap dish with holes drilled it in can also be effective...
  
  I live in Florida where the humidity is quite high; it's currently 6:15am, 75°F and 95% humidity outside. Despite the high humidity, my home is often pretty dry (as low as 36% sometimes) because I keep the A/C cranked year round. For a while, I kept my guitars on the walls, but started noticing that the tops were getting rippled and that the tops and back were looking a bit concave. Now I keep them inside the cases and use Arion Case Humidifiers (wrapped in socks) and Caliber Hygrometers inside the cases:
  
  https://www.dropbox.com/s/c403mrai9gfpm07/20180530_151913.jpg?raw=1
  
  https://www.dropbox.com/s/4yxkgtxga3eme5i/caliber-iii.jpg?raw=1