How it Works: Dehumidifiers
Excess humidity can encourage the growth of mold and even damage a house’s structure and furnishings over time. Many homes control indoor humidity with a dehumidifier. In this “How It Works” article, managing editor Debra Judge Silber explains how these machines remove humidity from the air. A liquid refrigerant passes through evaporator coils, which contact incoming air. Moisture from the air condenses on the cool coils and drains into a tray. While passing through the coils, the low-pressure liquid absorbs heat from the air and evaporates into a gas. The compressor squeezes it into a high-pressure, high-temperature gas before it flows into the condenser coils. There the refrigerant gives up its heat to the outgoing air and condenses back to a liquid.