Final answer:
Cal's church differs from Scout's church in amenities, such as the absence of air conditioning, and in the socioeconomic status of its congregation members.
Step-by-step explanation:
Two differences between Calpurnia's church and Scout's church in To Kill a Mockingbird can be seen in their physical amenities and the composition of their congregations. First, Cal's church is likely much less well-appointed than Scout's; the reference to the absence of air conditioning and comforts hints at a more austere environment, which might also reflect in more impassioned and heartfelt sermons. Second, the socioeconomic status of the members appears to be different, with the implication that people who might prefer more comfortable surroundings could avoid joining a congregation with a simple building, suggesting that Cal's church caters to a less affluent community.