Where is the evaporator coil located in a split system?

In a split system air conditioning setup, the evaporator coil is indeed located indoors. Its primary function is to absorb heat from the indoor air. As refrigerant circulates through the evaporator coil, it evaporates and absorbs heat, cooling the air that is then circulated throughout the living spaces.

This placement is crucial for effective cooling; the coil needs to be in the environment it is cooling to effectively lower the temperature of the indoor air. The outdoor unit typically houses the compressor and the condenser coil, which are responsible for expelling heat absorbed from the indoor air.

While the options mentioning specific locations like the attic or basement could theoretically house the evaporator coil, they are not general principles of where the coil is located. The key understanding here is that the indoor unit of a split system is designed specifically to accommodate the evaporator coil to maximize efficiency in cooling.