There are many reason behind central A/C is not working or cooling because air conditioning unit have several possibilities problems including: Bad capacitor, bad compressor, burned wire and many more. So. I think you have to proper repair your A/C by the best technicians. There is a company named Nevada Home Energy, They are experts in AC repair in Reno
. I should recommend you to repair your central AC from this company. You will be fully satisfied with their services.