I have a Trane XE 1200 Heat Pump unit with an electric furnace... It was working fine until we had a recent cold snap, and now it blows cool... not warm air... Can anyone give me any suggestions?

Is the heat pump running when you call for heat? You can try and move the thermostat mode to emergency heat to see if the aux heat is working.

Check the capacitor at the outdoor unit. If it appears swollen or is leaking fluid, replace.