Good job ! Keep it so !
You need to add these lines :
If V < TargetTemp - Hyst then ' Below Target temperature - Hysteresis
PORTA.2=1 ' Activate Warm Output
PORTA.3=0 ' Deactivate Cold Output
EndIf

If V > TargetTemp + Hyst then ' Above Target temperature + Hysteresis
PORTA.2=0 ' Deactivate Warm output
PORTA.3=1 ' Activate Cold Output
EndIf
just in front of
GoSub SelectSign ' +/blank/- Sign
GoSub DisplayTemp ' Temperature to LCD


Goto MainLoop ' Do it forever