The voltage is 120 volts in the US and Canada and is common in older homes. Do you see three wires? The next one might be the C-wire. You can do a few things to determine if one of these three wires ...

Honeywell’s manual budget thermostat works well with low-voltage heating systems ... infrastructure through a dedicated wire known as the C-wire. A C-wire provides a connection directly to ...

No C-wire? Some smart thermostats will work without a C-wire ... Power always needs to be shut off at the circuit breaker when working with or installing a line voltage thermostat. In some cases, it's ...

Unlock to see our ratings and compare products side by side The primary power for this thermostat is supplied via c wire (24vac). A "C" wire is not required for most ...

Your thermostat is some of the oldest and simplest automation in your home. For years these were one-temperature setting and nothing more. Programmable thermostats brought more control; they’re ...

This is a low-voltage return wire that’s an essential part of powering the thermostat – ask a professional if you’re unsure. The Ecobee would like a C wire too, but also comes with a power ...

This is for line-voltage electric heating systems only ... Almost all smart thermostats require a C wire to work, but older houses with older heating systems usually don't have a C wire because ...

Indicates that when using a 2-wire setup, whether the thermostat draws power through the wires to charge a battery. This may cause some HVAC systems to operate unpredictably or erratically.

Jon Reed is a senior editor overseeing coverage for CNET's home, energy and utilities category. Jon has over a decade of experience of writing and reporting as a statehouse reporter in Columbus ...

Here are the best smart thermostats that will intelligently heat and cool your home and save you money. When you purchase through links on our site, we may earn an affiliate commission.

Christina is a freelance editor and contributor with Newsweek’s small business team. With a passion for small business optimization and strategy, Christina has successfully launched her own ...