Serg has cleaned my ducts before so when I needed to replace my furnace, I called him, he came next day and gave me a more than reasonable quote. 2 big box stores were about double and triple his quote for the same unit! They started work early in the morning so that they could finish in 1 day out of consideration for me as I am pregnant with twins and they did not want to leave me without heat in the winter, even for one day. I am so grateful to Panda, they did a great job. I was honest with them on what I needed and wanted, and they did a great job for me.