Steve's Plumbing & Heating installed a humidifier, air exchanger and an air purifier with the heating and air system. They did an absolute wonderful job! They were great about explaining things to me that I wasn't quite clear on, making sure that I understood all that I needed to with regard to the system. They were extremely nice, even to my dog who tries to be very helpful and in the way sometimes. They never seemed to mind and were very friendly to him. I am very pleased with the installation and very pleased with the technicians that came out! Terrific experience!