“I have an old Honeywell programmable thermostat. Can't remember number of wires. Will this thermostat work then?”
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This wifi thermostat requires a constant power supply, NO batteries....As such it requires a C wire to provide 24v power to include wifi capability....If your existing stat has a common or C wire you're good to go. If not, a good HVAC guy can run the extra wire, and hook up the stat. It is a great thermostat and I can check temps from anywhere with an internet connection
Sorry, there was a problem. Please try again later.Hi Charles! Thank you for reaching out. The Honeywell Programmable Wi-Fi Thermostat is compatible with most 24 Vac heating and cooling systems (including Heat Pumps and Multi-Stage Heating and Cooling systems) however, this Wi-Fi thermostat requires a C wire to operate. The C, or common, wire brings 24 VAC power to the thermostat. Many older mechanical or battery operated thermostats do not require a C wire. If you don’t have a C wire, try looking for an unused wire that is pushed into the wall. Connect that wire to C and check that it is connected to the 24 VAC common at your heating/cooling system. Note: Not all heating/cooling systems label the 24 VAC common C. Check your system manual or contact the manufacturer to find out which terminal is the 24 VAC common. To wire your HVAC equipment to the thermostat, you will need to know what terminals they were connected to on your previous thermostat and/or the functions of the wires. You can find those by tracing them to your HVAC equipment. This thermostat comes with stickers labeled with terminal designations to help you wire your thermostat correctly. If you still have questions or need assistance with wiring, feel free to contact Honeywell Technical Support at 1-800-468-1502 and we will be happy to assist you. I hope this was helpful! Have a great day!
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