ISO- a/c repair person.. we need a tune up on our central a/c.. it's blowing hot and freezing over - think the coils need to be cleaned or freon added. I know Home Depot will come out and do the tune up for 99 and I will call them in the morning, but, with how tight money can get in the summers, I wanted to check here first in case someone needs the job more than a big box store.