Air conditioner does not blow hard enough to cool/heat car on hot/cold days. on 2007 Chevrolet Cobalt

The air con on my Cobalt works, but it doesn't blow hard enough to actually cool the car. On a hot day I have to put all vents on me and keep a window partially cracked to keep from sweating profusely. My other cars aircons are like hurricanes but this one is anemic. I did have coolant replaced at the dealer and they checked lines for leakage but that was it. No alleviation
of problem. Any thoughts?

Asked by for the 2007 Chevrolet Cobalt
ck cabin air filter under glove box poss plugged
Air filter was very dirty. Replaced it. Altho it's not bolwing my socks off there was much improvement. Thanks for the tip.