Air Conditioner Giving Hot Air

The air conditioner in my car seems broken…?
It just got warm out so I went to use my A/C for the first time (2003 chevy cavalier, btw) and it’s definitely not blowing cool air. It actually seems to blow whatever temperature it is outside into my vehicle (this morning it was cooler, maybe 60 and I tried it and the air was “cool” but definitely not the chilly a/c air that it’s supposed to be). When it’s 80, it feels like hot air coming through. Someone told me I could be low on freon (sp?) and I saw a DIY a/c kit at Auto Zone for about $25.00. Should I take it to the shop or give the self-treatment a go? Any input would be greatly appreciated.
When you turn on the a/c if the compressor is working properly the motor should “drag” a bit. and by that i mean itll make a deeper noise and run at a little bit higher rpm. it takes quite a bit to turn the compressor pully so the motor has to work harder. if the compressor works then you prolly need freon. But on a car that new, you prolly have a leak if its already low. So i would find a place that tests it for free to make sure you dont have a leak. If you dont have a leak then you should buy the kit from the parts place. Its a lot cheaper to do it yourself. And its not hard at all, just follow the instructions.
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