If you turn on your home air conditioner and it is blowing warm air, you may need to have Freon added to the unit. Freon is a cooling agent used in most air conditioning systems. Every air conditioning system needs a refrigerant that actually creates cool air, that’s the role of Freon. If you believe your air conditioner’s refrigerant lines might need recharging, call a professional to do the job. He will have all the appropriate tools to detect and diagnose the problem. There are very few air conditioner problems you can handle yourself. It is best to call an HVAC (heating, ventilation, air conditioning) professional to give your AC a check-up before hot weather arrives. De Hart Plumbing, serving Manhattan Kansas, Junction City Kansas and Wamego Kansas.