I couldn’t determine where the unusual stink in my property was coming from. I had been stinking this aroma that reminded me of spoiled milk or vomit. The only thing I could feel was that it was coming from my air vents. I never thought it could be the cooling system that stinks like barf. I had to call the Heating plus Air Conditioning company plus have them do a full inspection of the cooling system plus the HVAC duct. I was sure if the aroma was coming out of the air vents when the cooling system came on, the stink had traveled deep in the AC ducts. The cooling system had turned on about five minutes before the Heating plus Air Conditioning expert arrived, plus the aroma was still strong in the house. He knew why I had called before I even had the chance to tell him. He checked the cooling system first, plus said that there was nothing wrong in it. He was now inspecting the HVAC duct. He told me he would call the Heating plus Air Conditioning company plus have them send out a team of skilled HVAC duct cleaners. They would clean the HVAC duct, plus air vents, making sure that all the dust debris, plus possible bugs were done. They would also inspect the HVAC ducts to ensure there were no breaks or separations at the seams. 2 days later, the HVAC duct was being cleaned. I couldn’t guess how great my property smelled now. The aroma of spoiled milk plus vomit was no longer in the property when the cooling system kicked on, but it stinked clean plus fresh. He said he couldn’t tell me what the aromas were, but they were just a culmination of all the dirt, dust, dander, plus debris that had built up in the HVAC duct.