I bought a $79 Groupon that included 10 vents, hot water tank, main furnace and replacing furnace filter and at the end of the day I paid an extra $180 more because fine print said the have to do ALL vents and found out they installed a temporary filter in the furnace that I have to replace in a month. Not to mention he cleaned six vents in our basement that we are currently having finished and didn't ask first.