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Tried AC for the first time this year and it won't get cold

I have a window unit AC from Walmart that I only have installed for a month or two in the summer.
Never had any issues.
I installed it last night and ran it all night, it never got cold.
I tried cleaning the filter, messing with the temp knob on the front, nothing.
Basically it's just a fan right now.
I hear the "whine" of what sounds like a compressor kicking in but no cold air.
Is this something I can troubleshoot? If not and I have to buy a new unit, is this worth anything on craigslist for parts or repair?
Question from user ShabazzCBD at AirConditioners at reddit.
It sounds like there might be an issue with the cooling system of your window unit AC. While there are a few things you can try to troubleshoot the problem, keep in mind that working with electrical appliances can be dangerous, and if you're not comfortable or experienced in doing so, it's best to contact a professional technician for assistance. However, here are some basic troubleshooting steps you can attempt:
Power and settings check: First, ensure that the unit is receiving power and that the settings are correct. Make sure it's plugged in properly and that the temperature and mode settings are appropriate for cooling.
Clean the coils: Dust and debris can accumulate on the condenser coils, hindering the unit's cooling efficiency. Turn off the unit, unplug it, and carefully clean the coils with a soft brush or vacuum cleaner.
Check for ice buildup: Sometimes, excessive ice buildup on the evaporator coils can block airflow and prevent cooling. If you suspect this is the issue, turn off the unit and let it thaw completely before trying again.
Inspect the compressor and fan: If you're comfortable with basic electrical troubleshooting, you can inspect the compressor and fan for any visible damage. Ensure that the fan is spinning freely and that there are no loose or damaged wires.
Check the refrigerant: Low refrigerant levels could be the cause of the AC not cooling properly. However, refrigerant handling requires specialized equipment, so it's not something you can easily do yourself. A professional technician will need to check the refrigerant levels and recharge the system if necessary.
If none of these troubleshooting steps work, and you're not able to fix the issue yourself, it might be time to consider getting a new unit. As for selling the non-functioning unit on Craigslist, there might be some people who are interested in buying it for parts or repair. However, don't expect to get a high price for it, as it's not functioning correctly. Be honest about the issues when listing it for sale.
Before disposing of or selling a broken unit, consider checking if there are any local recycling or electronics disposal programs available. It's always best to dispose of electronic devices responsibly to minimize environmental impact.
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Twintech's Salesman Dave arrived promptly was friendly and courteous, listened and assured us the installation would be completed according to our requests. The crew arrived early morning on May 11th, 2018 and worked through till late afternoon non-stop. They were very friendly, very professional, their expertise was excellent, their workmanship outstanding and the installation was completed in a timely and efficient manner. We were completely satisfied and happy with the quality of the work.
I had cold and hot spots all over my 70 yr old home. My furnace is quite new and Greg optimized the fan and furnace. The original installer just took it out of the box with factory settings and installed it- basically running at 50% of capacity. Greg also routed heat into my laundry room, yeah - so now I can renovate laundry room - thanks Greg. He is honest, professional and knowledgeable. I will be calling him back in the spring to optimize my AC as well.
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Greg was prompt on the scheduled day of installation and the work was done well within the time estimated beforehand. Installation was neat and the equipment and scope of work was as specified in the quote. One item I must point out is that we were faced with a "No Heat" situation the day before the scheduled installation and Greg came out to address it free of charge. Not only that, but he also corrected an installation fault with our smart thermostat that was not part of the original job, again free of charge.
Greg came by to do a routine furnace checkup. He was very knowledgeable and professional, letting me know what's being checked/adjusted and giving me tips to ensure everything runs smooth. Very honest and upfront about what's working fine vs. what may need to be fixed/replaced. He didn't attempt to up sell anything that wasn't necessary. I'm glad to have finally found someone I can trust and rely on for all my HVAC needs - furnace, A/C, and hot water tank.
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Installed professionally, no delays, no rework needed. Very reliable contractor and sales person. Also installed BBQ gas line and some duct work.
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We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
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TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!
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