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1. Look for a thermostat with a battery backup: A Wi-Fi thermostat with a battery backup can provide power to the thermostat in the absence of a C wire. This is especially useful if you don't have a C wire running to your thermostat.

2. Check your HVAC system: Some HVAC systems do not require a C wire, so it's important to check your system before purchasing a Wi-Fi thermostat. If your system is compatible with a Wi-Fi thermostat without a C wire, you can avoid the hassle of running a new wire to your thermostat.

3. Choose a thermostat with a power extender kit: Some Wi-Fi thermostats come with a power extender kit that can provide power to the thermostat without a C wire. This kit can be installed in the HVAC system or at the thermostat location.

4. Consider professional installation: If you're not comfortable installing the thermostat yourself, consider hiring a professional to do it for you. They can assess your HVAC system and install the thermostat properly, ensuring that it works correctly and efficiently.

5. Look for a thermostat with a low-power mode: Some Wi-Fi thermostats with no C wire have a low-power mode that can help conserve energy. This mode reduces the power consumption of the thermostat, which can help extend battery life.

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1. Battery-powered thermostats: These thermostats use batteries to power the device, eliminating the need for a C wire. However, you will need to replace the batteries periodically to keep the thermostat functioning properly.

2. Power extender kit thermostats: Some Wi-Fi thermostats come with a power extender kit that can provide power to the thermostat without a C wire. The kit is installed either at the HVAC system or at the thermostat location and can be a good option if you don't have a C wire available.

3. Smart thermostats with power-saving modes: Some Wi-Fi thermostats have a power-saving mode that can help extend battery life. These thermostats reduce their power consumption when not in use, which can help conserve energy and make the battery last longer.

4. Wireless thermostats with remote sensors: Wireless thermostats with remote sensors can help conserve energy by only heating or cooling the rooms that are occupied. These thermostats communicate wirelessly with the sensors and do not require a C wire for power.

In summary, when choosing a Wi-Fi thermostat without a C wire, look for a thermostat with a battery backup, check your HVAC system, choose a thermostat with a power extender kit, consider professional installation, and look for a thermostat with a low-power mode. With the right thermostat, you can enjoy the convenience of remote access and energy savings, even without a C wire.