Servicing your air conditioning unit is comparable to servicing your car. If you don't put oil in your car, it will eventually blow out the engine and no longer run. Replacing an engine is a lot more expensive than replacing a few quarts of oil. The same principle applies for A/C. Professionals clean coils and change filters to give the unit more air flow. If these parts go too long without being serviced, they can overheat and the compressor will burn out. This leads to spending more money on parts than you would have spent towards annual service.
