1) Filter is dirty - Have a look and give it a quick clean.
2) Setting Thermostat Too High/Low - Try not to run your system too hard. Set an average temperature.
3) Check the outdoor unit - make sure the compressor sounds normal and is free from obstructions.
4) Refrigerant Leak - This is the final call. Only ring a professional in once you have tried the first 3 points. A contractor may charge you a bit of money to come out (usually a callout then per hour or part there of). They should be able to tell you if it is a gas leak or something else.
2 TON
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