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Contact a local pro and have them install a step down transformer to 20 - 30 V. In some cases, it’s possible that your system can be made Nest thermostat-compatible. High voltage systems, such as electric baseboard heaters, aren’t compatible with Nest thermostats. High voltage systems typically have a thermostat that is labeled 120 V or 240 V, and has two thick wires with wire nuts. The method may depend on your local electrical code requirements. Note: If your wires are stranded, you may be able to contact a local pro to cap, solder or replace stranded wires with a solid core wire, which will work with the Nest thermostat. When you’re done, reinsert it into the correct connector. If there is more than one large strand, the wiring isn’t Nest-compatible. You may need to pull one out of the connector to check. Look closely at the end of one of the thermostat wires. If your thermostat’s wires are high voltage or stranded, then your system isn’t compatible. But, it’s possible that a trained professional can make your system compatible.
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If you have an older thermostat, there may be a mid-plate that also needs to be removed to expose the wires. Some covers simply pull off, while others need to be unscrewed. Tip: You can listen for your system to turn on, or put your hand near a vent to feel if there’s warm or cool air that comes through.
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Wait at least 5 minutes to check if your system turns on (you’ll need to wait because many systems have a built-in delay).If it’s summer and you have system cooling, turn down the temperature.If it’s winter, turn up the temperature to turn on heating.If your system doesn’t have a switch, turn off power to it at the breaker or fuse box.Ĭhange the temperature on your thermostat by at least 5 degrees. There may be a switch on your system or near your system that looks like a regular light switch. This protects you and avoids blowing a fuse in your equipment.
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The online Compatibility Checker has full instructions to check if your heating and cooling systems are compatible with Nest thermostats, but here is some additional information to help you as you use it: How to turn your system's power off
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