If you want the better sound but don't care about the purifier, then get a DOHM sound machine. It uses a fan and sound great, and I'd guess the energy consumption is pretty trivial.

this feels like a 'dose makes the poison' scenario. you're talking about maybe $10 of difference annually if both were run continuously. and that's only if you bought an inefficient air purifier - if you elected to use, for eg, four Arctic P14 PSTs in a CR box then that's maybe double the kWh. this ends up being a couple of bucks more annually for the added benefit of having better air quality

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