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Some models also let you program separate schedules for different days of the week.
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(All configs are saved even if power is lost.)
Many manufacturers sell or suggest a separate C-wire adapter kit.
As simple as the RTH221B is to operate, we consider it similarly straightforward and DIY friendly to install.
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You don’t need a C-wire, just a few replaceable batteries.
It only works with single-stage heating and cooling, however, not with multi-stage systems.
It’s also compatible with heat pumps, but not auxiliary or emergency heat modes.
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This includes adjusting your home’s temperatures using voice commands through Echo smart speakers and other Alexa-enabled devices.
They run on minimal additional power while helping you activate your heating and cooling only when most needed.
The savings can be most noticeable if temperatures in your area fluctuate greatly throughout the year.
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The base color options include “polished” finishes of black, silver, and gold.
A Nest Temperature Sensor (2nd gen) even comes included to monitor temps in other rooms.
Installation remains simple, and you won’t need a C-wire in most cases.
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(If you do, a Nest Power Connector accessory is available to avoid running new wiring.)
It offers flexibility in scheduling, accurate and responsive temperature adjustments, and an attractive touchscreen interface.
One important thing to check is whether the thermostat requires a C-wire, or common wire.
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Many models use this to keep a steady flow of electricity to a Wi-Fi receiver or display.
This includes furnaces, air conditioning, heat pumps, and most radiant heat setups.
Most other programmable thermostats, though, support multi-stage systems that offer two or three levels of operation.
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Then there are 7-day thermostats that offer the option for a different program on each day of the week.
Why Trust The Spruce?
Anton Galanghas written for The Spruce since 2022, focusing on home technology, smart devices, and appliances.
PHOTO: ecobee
