Mount Pleasant is a large suburban town in Charleston County, South Carolina, US It is the fourth largest town. For several years beginning in the 1990 to 2000 it double in population, and is still growing very fast today. My experience with serving the Mount Pleasant area is always a pleasure. I really enjoy getting to meet so many different people and becoming like a part of their family. Southern Seasons Heating and Air enjoys working with the people that live in Mt Pleasant, SC.