My mother works as an industrial chemist. Her work is to basically mix chemicals to make odd agents such as fertilizers for farmlands, medicine, or aerosols. These chemicals are severely dangerous especially when inhaled. She works on a contract basis and the last business that she worked for, had a ductless mini split device that had been neglected. As she mixed the chemicals she could easily feel the chemicals settle on the surfaces of the lab however she had on gloves and a mask. The management had not performed even a single Heating and Air Conditioning maintenance repair since it was installed a couple of years back. My mother, being experienced, made a proposal to the supervisors to have the heating and cooling device assessed by an a/c rep so that it tested optimal levels. Cooling experts from the household comfort business came to the lab the following day and were horrified by the condition of the commercial a/c device. The quality a/c filter was absolutely filthy with all sorts of pollutants including harmful chemical residue that pretty much everyone at the plant was inhaling regularly… No wonder there had been a number of cases where employees had contracted respiratory diseases. Other components of the HVAC device were worn out from years of neglect. The specialists made the suggestion for replacing the unit with a quality Heating and Air Conditioning system, a hybrid Heating and Air Conditioning device. They would embed a smart Heating and Air Conditioning to improve its efficiency. All the needed components such as the programmable control unit were supplied by the local cooling and heating device business. The management of the chemical plant was entirely grateful to my mother for illustrating the importance of having an air conditioner device worker assess a unit regularly.