COIT opened in San Francisco in 1950 at the foot of Coit Tower and has grown into a franchise present in 31 of the 50 largest US markets. Air duct cleaning is one of its core household services along with carpets, rugs, upholstery, drapery, tile and water damage restoration. Technicians are IICRC certified, the whole system is cleaned rather than the visible registers, sanitizing is offered as an option, and the free written estimate holds for 90 days, which makes budgeting easier when the furnace visit can wait until autumn.
Handy for a household that wants ducts, carpets and drapery done on the same day and appreciates seasonal discounts of up to about 15 percent. Weak point: outside the franchise cities there is nobody to call, and duct cleaning is not the company's central skill, so the depth of the job depends on the local branch and its equipment.
Address: 897 Hinckley Road, Burlingame, CA
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