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I originally purchased a QHY9mono and could run it down to -30C no problems but I always seemed to manage to screw the nose piece off when removing it from the filter wheel. I bought 0.5Kg bag of desiccant on eBay for about $30 and now chuck it in the oven at 97C for 6 hours then throw the lot in a large sealed plastic bag overnight. Screw the nose piece back on the next afternoon whilst the bag is still sealed and it's done. No dewing problems whatsoever. Only other problem was finding enough nights with clear skies to do LRGB captures. Simply couldn't get enough so bought a QHY10C which is overkill for a 10” sct but at least I'm future proofed a bit.
Cheers
Stephen
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