Ford Escort 2001 Air Conditioner

My A/C stopped working and my mechanic indicated after recharging it (and it still blowing hot) that it was my air conditioner module. He said it was linked to other electronics on my car, which was typical of 1998-2001 models. Does this sound plausible, and how much should it cost to fix? Also, if I don’t fix it, will I have other problems?