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No, not all thermostats require a C-wire. Older manual and programmable thermostats typically do not need one. While many smart thermostats do require a C-wire to function correctly, some models can operate without one, often at the expense of certain features. A C-wire provides a constant source of power, which enables the thermostat to stay connected to Wi-Fi and keep its display screen lit on-demand. If you are upgrading from an older thermostat to a smart model that requires a C-wire, you may need to install one first for it to work as intended.

If only half of your outlet works, there are usually two possible causes: faulty wiring or a half-hot outlet. The first thing you'll want to do is check the circuit breaker panel to ensure that it's not tripped. If your circuit breaker isn't tripped, turn off the electricity and inspect the wiring to see if anything has come loose or corroded. 

If you have a half-hot outlet, it means half of the outlet is controlled by a switch somewhere on the same circuit, which should be nearby. This is an intentional electrical design commonly found in rooms without overhead lights.

You should hire a licensed electrician who is insured to perform any electrical work on your home, including lighting installation. States have different requirements for licensing and certifying electricians, so use Angi’s state licensing tool to review local guidelines.

Here are a few questions to ask electricians before hiring:

• How many years of electrical experience do you have?

• Are you licensed, bonded, and insured?

• Do you work with subcontractors?

• Do you provide a guarantee or warranty on your work?

• What is the timeline for completion?

• How do you handle change orders?

• Can you provide at least three customer references?

If you strictly adhere to electrical safety rules, including assuming that a circuit is hot until proven otherwise, and have some knowledge of how an electrical circuit works, you can likely replace a light switch by yourself without too much trouble. However, it's always advisable to call a nearby electrical pro to do the job if you're unsure of any steps necessary to change a light switch.