The evaporator coil is one of the crucial components of your central cooling system. This coil sits either on top of your furnace or inside your air handler (depending on whether you have a furnace or not). During this portion of the air conditioning process, the cool liquid refrigerant absorbs the heat from the air, effectively cooling the air down and raising the temperature of the liquid refrigerant. The cool air is distributed around your home through your duct system while the refrigerant, now a gas, is cycled back to your compressor.
Replacing an Evaporator Coil
If you have to replace your old evaporator coil with one compatible with R410A, make sure you replace both the indoor and outdoor coils. With the switch to R-410A from R-22, it is important that your coils are both designed for the same type of refrigerant. There are some coils that are designed for both, but R-22 is slowly being phased out because of its ozone-depleting properties. This means that the price of R-22 refrigerant will steadily increase as it becomes less and less available.