Your air conditioner seems to be doing just fine the last time you checked, but that last time may have been the only time you took notice of your old AC unit. Don Vandervort of HomeTips shared several signs of damage in your cooling systems; see if your air conditioner needs to get repair services from a contractor of HVAC in Rancho Cucamonga.Some kinds of air conditioner damage can be easily fixed. An AC unit not turning on could be fixed by a few adjustments to the thermostat. Checking the battery and the settings can easily bring your AC back to life. Faulty air conditioners sometimes just need a few parts replaced. If your current air system is making you feel more uncomfortable, you can change the filters on a monthly basis.