The Mad Hatter Service Company is a chimney, hearth and duct cleaning company in O’Fallon, Missouri, west of St. Louis.
Its work covers chimney sweeping and repair, air duct and dryer vent cleaning, and the sale and installation of hearth products and outdoor grills. That is a narrower trade than most entries in this category, closer to chimney and fireplace work than to heating and cooling systems.
The listing reached this directory under the shorter name The Mad Hatter and with a domain missing a letter, which is why the company’s site did not resolve when the record was first checked. Both have been corrected: the company trades as The Mad Hatter Service Company at madhatterstl.com, and its Google Business Profile is claimed and long established.
Missouri does not license chimney sweeps. The credential the trade uses is voluntary and issued by the Chimney Safety Institute of America, so whether the technician sent to a job holds one is worth asking.