Quote:
Originally Posted by EdFNJ
IIRC ours had 4 or 5. We have a Carrier Heat Pump here (~9 years old) and whatever wires are there are fine. You can even connect these to a 3 wire 30 year old system (we did that way back when). It does have to have a "C" wire which caries the 24V voltage to keep it on but every system here surely does that and even if it didn't you can install a power block. Just take a photo of existing wires as they are hooked up before removing old T-Stat. If you can change a wall switch you can install one of these. Just follow the setup. They make it ALMOST fool proof. If you have minimal handy-man capabilities you can save yourself the $200++ they charge to install them. Just turn off the power so you don't short it out. 24VAC can't hurt you but it can the T-stat.
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Not that easy if you have a Carrier Edge thermostat. There is a control box by the blower in the garage that complicates everything. I have seen internet threads implying you need a 7 wire feed to the thermostat.