Hi Cliff,
Defrost frequency depends on the humidity in your area and how often you open the door. We generally did ours about once in 5-6 months, depending on location. The condition of the door seals also has an effect - air leaks increase the need to defrost.
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1976 Newell Classic (Sold)
Home Base: Riverside, CA
If anyone needs my contact info private message me and I will send it to you.
-Joseph-
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