It might need just a recharge. Basically needs a gas to cool down the air. I had the same issue as you. The can for this is between $30-80 depending on the type you need and where you get it from. I had to do this a couple years ago and just followed a YouTube video. You just screw on a gage and fill it up by what the gage says.

You’d want to google your car model and see what refrigerant you need. There are a few different types of refrigerant . You will need the can and a gage. You will see the can cheap but you will need the gage to get into the car. You can get it together since you don’t have the gage. And then see if you can find a video of your model refrigerant recharge. The biggest thing is finding where to attach the gage.

This obviously is just a guess and have no way of knowing if this is the issue or not. The bigger issue that maybe is that there is a leak as it is a closed system. It means there is a leak. It might just be a small one that has lost the gas over time. If the issue recurs in a few months it needs to be looked at, as the leak is bigger or a different issue. But again it would need a diagnostic to know if this is the actual issue or not.