K.S.
Yeah usually homedepot is the best bet. I'm sorry they are out I guess with us into hurricane season they are gobbling them up. I'd research those a/c's online and see which manufacturers and where. If your a/c is not working well I have to ask. When was the last time you had it cleaned out. They back up and need cleaned out like everything else. And actually you'd call a plumber to clean out your line not a a/c person. though the a/c person can clean you coils etc.