How does a typical RV (absorption) refrigerator work?

Unlike traditional home refrigerators, which use compressors and refrigerant gas (usually Freon), absorption refrigerators rely on a heat source to drive a chemical reaction that creates a cooling effect. Here’s how it works:

Your RV refrigerator has two different ways to heat up the cooling coils:

1. An electric heating element (when running on shore power).
2. A propane-fired gas flame (when running off-grid). Inside the refrigerator’s cooling coils, there are three key chemicals at work:

Ammonia, Water and Hydrogen

The heat source (electric or propane) separates the ammonia from the water.
Once separated, the ammonia mixes with hydrogen gas, triggering a flash freeze effect. This process cools the fridge and keeps your food fresh.
A small circuit board monitors the fridge’s temperature and a resistance thermometer helps regulate the cooling cycle, telling the fridge when to turn on and off.

Real simple. Great campfire conversation starter!