There speaks the voice of experience!
I would add that the official rotor blade covers are a royal pain to remove if they get frozen on to the blades - they are too long to get your arm up inside to loosen them. I found old parachutes over the blades and tailboom to be much more practical as a cover. Also, silly things like parking the nose to the East where the Sun comes up (if you can) helps to clear the windscreen.
Had a LongRanger with a sticky N1 gauge which didn't like working when it was very cold and would only come alive when things started spinning - 15% is when the blades start turning just on battery power.