During normal operation, solid-state dimmers generate heat. A solid-state dimmer is roughly 98% efficient and 2% of the power is dissipated as heat, causing the dimmer to feel warm to the touch. The closer a dimmer is run to full output and the higher the load (watts) on the dimmer, the warmer it will feel. Dimmers are small transformers and while transforming the energy that dims the lights, a buzzing sound is heard. This can be considered as the dimmer performing its function. These are perfectly normal and safe. Dimmers are designed to the strictest UL safety standards and can handle their full rated load without overheating. If a dimmers’ buzzing is able to be heard at a far distance or begins to become too hot to hold your fingers on for a short amount of time, the dimmer may be malfunctioning or dissipating more than the customary 2% as heat and you should consider contacting Hufnagel Electric to have your malfunctioning dimmer serviced.