Living in North Carolina, I see firsthand what humidity does to guitars. Wood is hygroscopic — it absorbs and releases moisture from the air. This constant movement can wreak havoc on your instrument if you're not careful.
The Ideal Range
Most guitar manufacturers recommend keeping your instruments in 45-55% relative humidity. Here in Goldsboro, summer humidity can easily hit 80-90%, while winter heating can drop indoor levels below 30%. Both extremes are dangerous.
What Humidity Does to Your Guitar
Too Humid (Above 60%) - Action rises as the top swells - Finish can cloud or develop haze - Electronics can corrode - Mold can develop in the case - Fret ends may feel smooth but the wood has expanded around them
Too Dry (Below 40%) - Top and back can crack - Fret ends protrude and feel sharp - Action drops dramatically - Binding can separate - Bridge can lift
How to Protect Your Instrument
1. Use a Hygrometer Get a digital hygrometer for your guitar room. They're inexpensive and invaluable. You need to know what you're dealing with before you can fix it.
2. Case Humidifiers For acoustic guitars especially, a case humidifier is essential. Products like the D'Addario Humidipak system work great — they both add and remove moisture to maintain the right level.
3. Room Control If you have a dedicated guitar room or studio, a dehumidifier in summer and a humidifier in winter is the gold standard. Keep the room between 45-55% and your guitars will thank you.
4. Wipe Down After Playing Sweat is corrosive. Get in the habit of wiping your strings and hardware with a dry cloth after every session. It extends string life and prevents corrosion.
When Damage Happens
If you notice any of the symptoms above, don't panic — but do act. Most humidity-related issues are reversible if caught early. Bring your guitar to a professional who can assess the situation and make adjustments. The longer you wait, the more likely permanent damage becomes.
The Bottom Line
In the Southeast, humidity management isn't optional — it's essential. A little prevention goes a long way toward keeping your guitar playing great for decades.