Here's a personal report about efforts to maintain 35°F refrigerator temp with 0°F freezer temp in ultra hot conditions...
I simply could not meet these temperature goals with an absorbsion refrigerator. A brand new 8 CF Norcold. With a fifty degree differential (Delta T) door shelf temps were in the sixties and interior fans maintained 45°F+ which impacted my food safety.
Best cooling unit effectiveness was achieved with the use of a noisy 225 CFM 24 VOLT fan placed right at the roof vent base. Passing air across any of the coils below did nothing or raised interior temps. The huge fan is utterly impractical energy consumption and noise wise.
I tried a Whirlpool home refrigerator. The result was 24/7 operation and a temperature curve that bulged into the forties during the afternoon.
Trial number three was a knee knocking purchase of a 24 volt Vestfrost refrigerator that weighs 300 pounds. Due to insulation. Due to weird dimensions this is an utterly impractical choice. My bus allowed me latitude in space.
Due to cost and hassle I nicknamed the refrigerator and freezer The Manhattan Project. The insulation and Danforth compressors did the trick. Still I needed a circulation fan inside and a small condenser fan outside. But door temperature was maintained in the high thirties and freezer temps maintained below zero.
Just for info. Outside air temps soared to 115°F
Because the reefer and freezer were so large a
P hour usage was cruel. 115 and 140. @ 24 volts.
So, chin up when things seem tough. The ultimate "fix" is neither inexpensive or easy.
I spent all spring and summer on the Caribbean coast. A trip to town was 200 miles. Forty years later has entailed 2 rebuilds plus 2 new motors.
I finally gave up in July and started a diesel genset 24/7 and 3 roof airs. That and a palmetto roof really cut down amp hour consumption. Diesel was 15 cents per gallon back then.
Following the advice of the people on this forum will be easier and cheaper :)
