Generally running air conditioning in your home will keep your guitars around 50% relative humidity. However, If you happen to live where it’s cool enough in the summer that you live with the windows open you can have as much damage from too much humidity as from too little. In Pennsylvania this morning it was 70 degrees and 80% relative humidity. At that humidity level guitar tops will swell and ultimately pull the top away from the braces.
If you live in a location with too much humidity, we offer a dehumidifier that will keep your instruments at 50% relative humidity. It’s a membrane technology that doesn’t require a water tank, so it can operate without you needing to empty a water container.