Dayco was established in 1985 by Terry and Bonetta Day for only $250. They saw that there was a need in the Tri-Cities area for high quality heating and air conditioning services. Their son Ken, now the general manager, joined them in the family business in 1990. Dayco is not only a local, family owned company, but with 51% of the company belonging to Bonetta, it is also a woman owned company!