Pure sine wave or modified for a Trane HVAC?
the laptop  wont care if its  modified sine wave power but  if you plan on running an ac get a generator the trane is using  a 1 hp capacitor start capacitor run induction motor, it requires  a true sinewave to run  using modified will ruin it and void the waranty. also truesine inverters are very costly. you should be fine using a 25kw generator.