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Most air conditioner problems are the result of improper installation procedures, or inadequate maintenance of the unit. If your AC installation is undertaken by an unqualified or inexperienced technician, there are any number of things that could go wrong, leading to the need for AC repairs later. For instance, if he fails to charge the correct amount of refrigerant, it could quickly lead to leaks. If the thermostat is not installed properly at the time of installation, you can find that the temperature in the room drops below the thermostat temperature. To avoid the need for frequent and expensive air conditioner troubleshooting, first of all, get your unit installed by a licensed and experienced air conditioning contractor. 
A unit that frequently needs AC repairs is the result of poor air conditioner maintenance. You can increase the efficiency of your unit and increase its life span by regularly cleaning the filters and replacing them. Filters that are blocked with dust and debris block the air flow, and drag down the efficiency of your air conditioner. Dust laden air may carry these particles into the evaporated coil, and affect its capacity to absorb heat. It's recommended that you get your air conditioner filters replaced, or cleaned at least once or twice during peak season. Pay more attention to your filter if your HVAC system sees heavy use or a dusty environment. If you notice water accumulation near the air conditioner, it might be the result of a leaky tube if you can locate a leak in the tube, get the tube replaced. If not, it may be a more complicated problem with the pump. Frequent central air conditioner repair problems can also occur if you have the wrong size unit. For instance, in an oversized unit, the AC may switch on and off frequently, wearing out the fan motors and compressor.