In order for the air conditioner to work for a long time and reliably, it is necessary to clean the hvac coils. https://www.fortador-usa.com/blog/how-to-clean-air-conditioner-coils-cleaning-hvac-coils helps with this - it describes in detail how to clean AC coils and the entire air conditioner. The device Fortador Volt Mini, which I bought on the company's website, is very helpful. I recommend trying to clean the air conditioner in the same way and you will see what a savings it is.