HVAC units are one of the most reliable appliances in your house, however sometimes you will encounter a situation. Many times, you can fix these problems on your own, but for more complex difficulties, it is best to call a competent HVAC technician. The most normal things an HVAC professional will check is blown fuses, damaged contactors, capacitors, gas valve, air filter, thermostat, drain lines, refrigerant leaking, and lastly the compressor. This fuse is what protects your compressor from overheating, so if the HVAC system is not properly heating or cooling, the breaker is about the first thing to be tested. Contactors and capacitors keep your system running smoothly, and if they are worn or burned out, they will need to be replaced. Sometimes, your gas valve can get corroded, limiting the flow out of your gas line to your equipment. If this is the scenario, it will need to be replaced. Cleaning or changing your air filter is among the most important things that you can, and should do yourself. A clogged air conditioning filter will cause your HVAC unit to run inefficiently, and may even cause it to seize up. Before calling an HVAC technician, check to note if your thermostat is turned on. It can easily be turned off or put on the incorrect setting. Drain lines should be cleaned regularly. Refrigerant leaks, problems with your compressor and coils are all problems that need to be handled by a professional. Your HVAC system should run safely and effectively for many years, if you have it maintained regularly with a professional HVAC technician.