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Several signs can indicate a light switch is bad. If the switch feels loose, slides down after you flip it, or requires multiple flicks to turn the light on, it may be failing. Other common indicators include flickering lights or a general failure to turn the light on or off. Pay attention to any unusual sounds, such as crackling, buzzing, or popping when you operate the switch. More serious signs, which can present a fire or shock hazard, include the switch feeling excessively warm or hot, sparking, smoking, or emitting a burning smell. If you notice any of these dangerous signs, stop using the switch immediately and call an electrician.

A C-wire connects your thermostat to your household heating and cooling system to provide continuous 24V power. The furnace's transformer converts household electrical current into this low-voltage power to operate the HVAC system's circuitry. In most configurations, the C-wire connects to the terminals labeled "C" on both the furnace's low-voltage terminal block and the thermostat. In some cases, if a dedicated C terminal is unavailable, the C-wire can be connected to the "G" (fan) terminal at the furnace.

When shopping for a multimeter to handle this job, make sure you purchase one that is able to test for capacitance. While most multimeters offer this function, some do not. You shouldn’t have to spend a lot of money to find the right multimeter. There are models that can perform this test that cost as little as $10.

Yes, electricians must be licensed, certified, and in most cases, insured. Licensing requirements vary by state and local municipality, but most U.S. municipalities require electricians to hold an electrical contractor’s license. It's always a good practice to confirm requirements with your local municipality. Even if licensing is not required in your area, hiring a licensed and experienced electrician often leads to a better end result.

A license is a legal requirement to operate a business and is necessary for pulling project permits. Certifications, on the other hand, are typically voluntary and demonstrate a certain level of expertise. In some cases, a certified electrician may send an apprentice or journeyman to perform the work, but they must operate under a primary electrician who holds the proper license.

Before hiring, you should verify the electrician's license, insurance coverage, and any third-party certifications. You can use Angi’s contractor licensing search to confirm a pro's license status. Additionally, businesses with the “Angi Approved” badge on our platform meet strict criteria, including having the required state and local licenses, passing a background check, and maintaining a high average rating.