I had a Norcold 4 door 1200. I would say once a month for deicing depending on where we were in the USA. The door with the icemaker needed twice the defrosting. I used a big hair drier one door at a time. I now have a Montana 375FL with the Residential Fridge and appreciate cold ice cream, speedy cool down. I do not dry camp much so the small inverter does not bother me.
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