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4-wires are for both heating and cooling, 3-wires are for either just cooling or heating (not both). The phone app uses the internet or your home wireless network, I've adjusted temps from my work 20 miles away through my phone app.
Sorry, there was a problem. Please try again later.There are several ways this product can be connected. Please refer to the compatibility checker. The phone connects to the thermostat via network, it does not matter as long as you are connected to the internet and logged into your nest account.
Sorry, there was a problem. Please try again later.I'm not sure about the 4 wires but it doesn't matter how far away you are from unit when you want to operate it from your phone.
Sorry, there was a problem. Please try again later.You should wire it exactly like the one that it replaced. If you have 4 wires then use 4 wires. My system is heat only and only had 2 wires. It will show up in theNest aApp on your phone if you log it on to your network during set up. The you can control it from anywhere.
Sorry, there was a problem. Please try again later.Each wire connects different things. For example, W for your heating, Y for your cooling system and G for your fan. You can operate it from your phone as long as you have some sort of internet connection.
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