I've already done some troubleshooting. Checked fuses and relays, they are good. Compressor clutch was not engaging. Bypassed the low pressure switch, and the compressor started (so the compressor clutch is good). With he compressor running, the system failed to produce cold air.
What that adds up to is the Freon leaked out. Could just be a hose, but I probably won't be that lucky. If it is the condenser, it will probably cost about $400 to replace and refill at a shop. I am big on DIY, but I don't have the tools (gauges, vacuum pump, Freon recovery) to work on air conditioners.