“my current thermostat has 4 wires. is there anyway to connect smart thermostat with only 4 wires coming out of wall”
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I'm not an expert but this is how I understand it: These smart thermostats need 24V AC to operate. You will need a 'common' wire (usually referred to as a 'C' wire). 4-wire systems often do not provide the voltage loop required. The fan wire sometimes can used as a common but then you lose the option to control your fan. Not a great option. In my system I have a 'C' wire which is connected to ground. I get 24V AC from my 'R' wire (Rh or Rc). I have a 5-wire system. >>>There are ways to add a 'C' wire. Check out Venstar's add-a-wire for example. https://venstar.com/thermostats/accessories/add-a-wire/ Honeywell might have a similar option. Contact Honeywell's tech support. I find they are very responsive.
Sorry, there was a problem. Please try again later.There is a way to use it with 4 wires but you might need someone knowledgeable with HVAC or an electrician and it may not function as well. They have instructions online with videos at the Honeywell website.
Sorry, there was a problem. Please try again later.There is probably a 5th wire wrapping the 4 wires together. However I suggest having an AC professional complete the installation because he'll have to change the wiring setup on the AC Unit as well. It's a bit of a challenge to program, but once it's done, you should enjoy the flexibility and ease of use if in the home or away at work. Hope this reply helps... Big fella.
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