What are Cased Coils?

Cased coils are pre-packaged evaporator coils enclosed in a durable, insulated metal housing. They're designed for easy installation and better protection of the coil itself.

🌬️ What Do They Do?

The evaporator coil inside the casing is where refrigerant absorbs heat from the indoor air. As warm air passes over the coil:

• The refrigerant inside the coil evaporates, pulling heat out of the air.

• The cooled air is then blown back into the home via ductwork.

🧱 Why Are They "Cased"?

• The casing protects the delicate coil fins from dust, damage, and corrosion.

• It ensures the coil fits securely and properly aligns with the furnace or air handler.

• It helps channel airflow correctly through the coil for efficient heat transfer.

🏠 Where Are They Found?

• Above a gas furnace (vertical installation)

• Beside an air handler in horizontal or downflow systems

• In attics, closets, or basements, depending on the home’s layout

📌 Summary:

Cased coils are the “indoor coil” in a residential split system. They’re responsible for absorbing heat from your home’s air and are protected in a metal shell for durability, performance, and ease of installation.