The answer to 'why is my thermostat leaking water' is that a leaking thermostat is typically caused by condensation buildup or a faulty component within the thermostat. Thermostats can leak water for a few common reasons, such as high indoor humidity, a clogged or malfunctioning condensate drain line, or an issue with the thermostat's internal mechanisms.
If you notice water leaking from your thermostat, it's important to address the problem promptly to prevent water damage to your walls, floors, or other home components. In some cases, the issue may be a simple fix that you can handle yourself, but in other situations, it's best to call in a professional HVAC technician to diagnose and repair the problem.