wcjeep wrote:
ARB makes a great one. Not cheap. The cheap units are good for about 20deg difference. Would be OK if on shore power or moving with vehicle alternator.
depends on the coach - my coach (engine) alternator charges the house batteries while we're traveling, so the 12vdc supplied to the basement cooler never stops & our house batteries stay charged.
NO cooler will run better on 120vac any better than it does on 12vdc.
Thermo-electrics won't do a sufficient job in the summer. compressor units will go down to at least -5 degrees (below zero) (f) - even on the hottest days.