They were scheduled to come between 8:15 and 8:45 in the morning, and we were told that they would call first. Showed up at 8:15 and when I asked if they had called, I was told "Nah, it's the first job of the morning, usually don't call." A little inconvenient, but fine. Asked him for 10 minutes to finish getting ready then. I noticed they weren't wearing masks, so I also asked if they had any masks they could wear. His response: "Well, we got our shots, did you get yours?" I told him that we were vaccinated, but I would still prefer it if they wore masks to enter our home. I was told "Yeah, we got them but you're the first in a long f***ing time to ask. We'll get them, but we hate wearing them." I told him that I was just asking him to be respectful. Came back 5 minutes later to say that they were no longer going to perform the service. When asked why, he said "Because we don't have to wear masks." Instead of having a conversation with me about why I'm requesting that they wear masks (both my parents have Stage IV cancer, and beyond that I'm not comfortable still having unmasked strangers in my home, especially if they're working on air circulation units), he became aggressive, cursed me out, and basically stormed off. You'd think that I asked him to promise me his first-born son. Called the company to discuss it with them, and was told that he was the owner. Christine, who deals with scheduling, was very courteous and professional, though still couldn't understand why we asked them to wear masks. A shame because they seem to have good reviews for their work, but customer service is absolutely atrocious. If you're looking for respectful professionals, then avoid this company at all costs.