Dykstra is my #1 heating/cooling company. Their tech Scott is very knowledgeable of my heating/cooling units. Scott always comes to my rescue and figures out the issue. He made 2 trips to my house: on his first trip he added freeon to my central air until cooled the house down and he stayed for 45 mins to make sure everything was fine. When he got to the next job my central air started making a hissing loud noise inside it. My compressor went out so now I have to buy a new central air unit. Scott took care of the paperwork and is making sure Tom calls me so I can get a new unit.