Arrived on site, for duct cleaning estimate. Counted 12 supplies and 4 returns downstairs. Counted 6 supplies and 4 returns upstairs. Found grills to be caulked, and informed homeowner that we would not be responsible for caulking the grills back after the duct cleaning was performed. Found homeowner to be using 1 inch filters, recommended using 4 inch filters to provide better filtration as his filter boxes have the capability to use them. Showed pictures of ducts to homeowner and reviewed duct cleaning estimate options. Brought to homeowners attention that his units used to have air scrubbers installed on both of his units, and provided estimates for reinstalling them at the largest discounted price we could provide. Also informed customer we would seal the 2-3 inch hole in the return that was left exposed to attic air should he go forward with an estimate.