Installing nest thermostat

[Callicabb1]

I only have two wires coming out from my Honeywell, thermostat, can someone help?

[Gtrrhythm]

Actually, that's pretty normal. My house had only two wires (red and white) which are very thin wires. This is a low voltage system. I hooked up my nest with just the two wires and it's worked great for going on three seasons. Mine is an oil boiler with steam radiators.

[CoolingWizard]

@Callicabb1 , depending on what type system you have it my or may not work.  The Nest Thermostat uses AA batteries and the Nest Leaning Thermostats have a rechargeable lithium ion battery.  If your two wire simply attach to a gas valve, it may be operating on a few hundred millivolts. When the thermostat connect T on the gas valve to the second T on the valve, the gas flows and the furnace or oil burner.  On systems that use a 24 VAC power system, these are completely compatible with all Nest Thermostats.  

The AC Cooling Wizard