The crawl space of our home needed to be vacuumed to remove all the dust, so that the space could be painted. It required a hefty size of vacuum and equipment to handle the large amount of dust (it have never been done in 30 years). The owner of the company attempted to perform the job but was ill equipped and essentially couldn't handle it, although he tried the hardest to complete it. I had to partially pay for the job and then hired another with a much larger vacuum truck.