A dehumidifier won't save your glass mousepad.

Probably not enough to matter.

The issue is simple: cold glass + warmer, humid air = condensation. That thin layer of moisture makes the surface slippery, which is the last thing you want for precise mouse tracking. A dehumidifier will lower the room’s humidity, but unless you’re running it constantly and aggressively, the glass itself is still cold enough to attract moisture from your skin and the air around it. You’re fighting physics, not just humidity.

The real fix is either warming the mousepad (let it sit in the room for an hour before use, or get a heated pad) or switching to a cloth or hard plastic pad that doesn’t sweat. Glass mousepads look cool but they’re finicky about temperature shifts.

If you’re set on glass, at least let it acclimate to room temp before you start gaming.