Founded in 1956, Black-Haak is a family-owned and operated business providing heating and cooling, plumbing and electrical services in Greenville, Appleton, Oshkosh, Neenah, Menasha, Kimberly, Darboy, Kaukauna, and throughout the Fox Valley and surrounding areas. We are proud to conduct business based on a firm foundation of honesty, integrity, family values, comfort, service, reliability and trust. Our reputation of strength shows through! It is our mission to provide customer comfort and safe operations of heating and cooling equipment and more. At Black-Haak, family is important – and our clients are family. From yearly maintenance on equipment to newsletters with valuable energy information, we keep our clients informed.