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Been following this thread for the sound attenuation part. I’ve put the soundproofing materials in my inner fan and plenum area as described in rotorbudd’s Dometic A/C dissection post and it lowered noise by about 3 dB. Using the same sound measurement app, and running the FAN only (no A/C compressor) I get readings of 63/66 (lo/high fan) with the phone on the counter. Any way to run this unit on fan only and come up with dB numbers? If it drops noise down to low 50’s that’s a good deal. Also, how is this unit powered and what did you do with the old thermostat? I’ve found that the standard gas wall heater fan works fine in some pretty cold weather without the A/C unit fan running and it works off the existing thermostat on Auto. Does this unit work constantly powered by utilizing the remote as a switch/thermostat? If so, is there a hot wire up there now with the current unit?
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