Our heating/ac unit was not working properly so we contacted 6&Fix to check the system out. It turns out that the system needed to be replaced because of carbon monoxide leak along with other issues from an 18 year old unit. 6&Fix worked with us to send one of their system designer/architects to our house that evening and we were able to schedule a replacement on Christmas Eve. They were very professional and courteous working most of the day on Christmas Eve to remove the old unit and install the new on in our attic. They left the house clean and we were back up with heat very quickly.