Goodman Evaporator Coils

The air conditioner evaporator coil is located inside your home (usually sitting on top of or beneath your furnace). Its primary job is to absorb heat from your indoor air. As the blower motor pushes warm air over the cold copper or aluminum fins of the coil, the refrigerant inside evaporates, soaking up the heat and carrying it to the outdoor unit. This process also removes humidity, making your home feel much more comfortable.

The difference lies entirely in the direction of your airflow and the orientation of your HVAC system:

A vertical evaporator coil is designed for "upflow" or "downflow" systems where the air moves vertically. These are most common in basement or utility closet installations.

A horizontal evaporator coil is used when your furnace or air handler is laid on its side, usually in an attic or crawlspace, where the air moves from left to right or vice versa.

Choosing the correct orientation ensures proper drainage of the condensation collected during the cooling process.

To maintain efficiency, your coil should be "matched" to the tonnage of your outdoor condenser. For example, if you have a 3-ton outdoor AC unit, you generally need a 3-ton coil. However, some high-efficiency systems use a slightly larger coil (e.g., a 3.5-ton coil on a 3-ton unit) to achieve a higher SEER2 rating. Always check your outdoor unit’s data plate for the tonnage or BTU rating before browsing our evaporator coils for sale.

Goodman coils are highly versatile, but there are two main factors to consider: physical fit and performance. A cased evaporator coil comes in standard widths (14”, 17.5”, 21”, and 24.5”) designed to sit perfectly flush with Goodman furnaces. While they can work with other brands, you must ensure the refrigerant type matches and that the cabinet width is compatible to avoid air leaks.

The most common sign of a failing coil is a refrigerant leak. Because these coils are often made of copper or aluminum, they can develop "pitting" or formicary corrosion over time. Symptoms include:

AC blowing warm air.

The system frequently running low on refrigerant.

Hissing sounds coming from the indoor cabinet.

Ice buildup on the indoor coil or the outdoor brass lines.

An air conditioner evaporator coil typically lasts 10 to 15 years. This lifespan usually aligns with the lifespan of the outdoor condenser. Because modern coils are thinner to allow for better heat transfer (higher efficiency), they can be more sensitive to corrosive elements in the air. Regular maintenance and keeping your air filters clean are the best ways to reach that 15-year mark.

Yes, this is critical. You cannot use an older R-22 coil with a modern R-410A or R-32 system due to different pressure requirements and oil types. If you are upgrading to a new system, ensure you are selecting a compatible R32 evaporator coil or R-410A coil as specified by the manufacturer. Using the wrong coil will result in system failure and will void your warranty.