First of all, when is a professional service provided without a receipt given? I was told that it would be emailed to me....going on two months now. I was sent a special promotion from Groupon for duct and furnace cleaning, and took advantage of what I thought was a good deal, I was totally wrong. The "free video" of the procedure, a before and after which was promised was not mentioned until I had asked about it, and then I was told that since I stepped out to the bank, a 4 minute trip in total which I had mentioned to the tech rep, missed the video. if there ever was sub-standard service, it's this company, the furnace wasn't cleaned, and dust fragments were left all over the house. Don't waste your time or money on this company's service. The $79.00 special soon became more than $100.00, they charged 13% HST without providing a receipt plus additional costs. Knowing what I know now, I wouldn't even take their service free of charge, thanks for nothing Daniel!