Has anyone had their air conditioning system sanitized before?

I try to know how the process works and sanitation if it causes chemical odors in the house? I start? use the air conditioner in our new apartment? whenever he comes on I find myself with a lot of t? you and the air smells musty. I t? Inform? cooling by the company it needs to? be scrubbed and s? disinfect? ??s, I am pr? occupied? by the chemicals they use as I am senstive to chemicals. Anyone that this be done before and how it performed? your home?