If you’re looking forward to the advantages and convenience of a new smart thermostat, an HVAC c-wire may be in your future, too.
Unlike the old thermostat it’s probably replacing, smart thermostats need consistent electrical power for great features like Wi-Fi connectivity, a large, bright touchscreen and other extras. In order to supply the continuous 24-volt power to the new unit, the c-wire (short for “common wire”) is required.
What Are The Options?
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- Maybe you already have one. In newer homes, the HVAC system usually includes a c-wire. If your house falls into this category you’re already good to go for installation of the newer, smarter thermostat.
- Maybe not. Old-school thermostats in many homes are battery-powered and didn’t need continuous additional electrical power. These HVAC systems typically lack a c-wire. In that case, you may need the wire installed as part of the new thermostat installation.
How Can You Tell?
Here’s an easy way to determine whether your home is already wired with a c-wire.
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- Take the existing thermostat off the bracket that secures it to the wall. It’s a simple task—usually the same steps as changing the batteries in the unit.
- Look for wires extending from inside the wall to the thermostat bracket terminals and count the wires.
- If you count five wires, you’ve probably already got a c-wire and installation won’t be necessary. Note: the c-wire may not necessarily be connected, but loose or folded up behind the existing thermostat.
- If you count only four wires, you’re probably going to need a c-wire put in when the thermostat is installed.
What Now?
C-wire installation is a routine procedure for a qualified HVAC service technician. The wire will typically extend from the new thermostat to a spare connection, probably on the electronics board at the furnace or A/C. This completes the circuit to power your new smart thermostat with 24 volts continuously.
Your source for new HVAC technology since 1922, the professionals at Paitson Bros. can tell you more about a c-wire to power your smart thermostat installation.
Jeff Paitson is a third generation business owner who continues to run the business with the same values that have been passed down from previous generations since 1922.
Jeff’s belief is that the business belongs to Jesus Christ; therefore 10 percent of the company’s profits go toward the Maryland Community Church.
Jeff is a Terre Haute Chamber of Commerce member and in his spare time, he enjoys 
Ethan Rayburn is a lifelong resident of Terre Haute and a 2005 graduate of Purdue University.
An Eagle Scout, Ethan spent four years as a non-profit executive with the Boy Scouts of America before joining Paitson Bros. as a comfort advisor and later General Manager. In that role, Ethan has brought a renewed enthusiasm for customer care, integrity, value, and service to Paitson Bros. Heating & Air Conditioning.
Ethan enjoys singing and was a member of the Purdue Varsity Glee Club. He also enjoys playing and coaching soccer, spending time with his family and two young boys, and volunteering his time and resources with his church, Terre Haute First Baptist Church, which he has attended from a very young age.
Paitson Bros
1 (812) 232-2347
Serving the Wabash Valley, IN Area Since 1922