I live in a 1 bedroom condo. Should I do an air duct cleaning after some number of years? Sometimes, I have a runny nose, it's clear so it's allergic, so I'm thinking that maybe an air duct cleaning will solve the problem. Do technicians have a way to inspect the air duct? maybe with a video camera inside the duct?

I live in Va. Until 2 weeks ago my a/c was cooling pretty good, keeping my house at 70. We had a storm in the middle of the week & since that storm my a/c has not been cooling the house very well, most days it has been 75-80 degrees in the house. Prior to the storm there were days I would sit at my bar (with a register below me) & need to put on pants or blanket because it was too cold sitting there. 3 nights ago my son & I cleaned the evaporator coils as best as possible, still the house only got down to about 75. 2 nights ago I had a technician out to look at it. Pressure checked ok but found the condenser coils were dirty. Cleaned the coils then checked pressure again, said it was low in freon, so he added freon. Suction line is cold, his gauge showed it was 45 degrees. By morning the house only got down to 76 degrees. Last night I came home & house was 85 degrees. I have another company coming out, unfortunately not for 3 more days. I don't know alot about a/c units but is there anything someone can suggest I check to possibly get this working better? Also is there anyone that thinks they know what the problem is so that I can ask the technician about when he gets here? Any help is appreciated Thanks