I know this is not a DIY job but, as a single woman, if I'm not slightly informed, techs will rip me off. Certainly not all, but it's happened many times. I've talked to three this week. When the first one came, he put in 1 lb of freon and then tried to sell me a new unit. 2nd one never called me back. Diff websites have helped me a lot, just to know what to ask for - like checking the temp at the vent.
The air temp coming out of the vent was only 7 degrees lower than the actual room temp. The first tech put 1 lb of freon in it but that did nothing. I got another tech to come and he cleaned the coil and said that if that didn't work it might need to be "weighed back in" --- something like there might be air in the freon and it needs to be emptied, vacuum the air out, and then refilled --- or maybe it was moisture instead of air ... IDK. He was planning on doing this on Monday, if the coil cleaning didn't work. It's MUCH worse now. The air temp has only a 3 degree difference now, and I think the outside unit sounds "different" than what it did before. I might be wrong though and just looking for things. I just turned it off today, but it is HOT (90) and going to be a long weekend!
Things I did b4 I called a tech: the filter is only a few wks old (changed monthly) and I tried turning it the unit off for 10 min and then turning it back on to reset when this first started and that didn't work.
I like the last tech that came out, even though they asked me if I was married when I made the appt (what does that matter??). He seems to be going in the right direction, but he did comment on how I knew as much as I did (and I don't that much). I told him I had electrician friends in another city LOL.
Right now, the freon is full, the coils are clean, there's no ice anywhere, and the unit is 9 years old. Oh, and I remember him saying the pressures were good (didn't really understand it, but he said it).
A retired electrician friend of mine told me to have him check for a "blocked screen" b4 he dumped (vacuumed, refilled, weighted --- whatever it's called) the freon. Anything else you can think of, or anything that I should be sure to ask him about would be greatly appreciated. Sorry if my explanations aren't good. Since I'm not a tech, techs try to tell me things in laymen terms that often don't make sense when I try to tell it to another tech.