Black-Haak Heating
Family-owned heating, cooling and plumbing contractor in Greenville, Wisconsin, offering sump pump, generator and furnace work for basement flooding, power cuts and winter readiness.
What they do
Greenville firm serving the Fox Valley since 1956, run by a family. It repairs and replaces sump pumps and clears drains, which helps when water starts building up in a basement. For backup power it installs generators, including Generac models, and does panel upgrades. Heating and cooling work covers furnaces, boilers, heat pumps, ductless mini-splits, air conditioning, water heaters and general HVAC repair and installation. Emergency service is offered, and financing is available. The business also handles commercial buildings and offers indoor air quality equipment and geothermal systems. Its service area includes Appleton, Oshkosh and Neenah as well as Greenville.
- Sump pumps
- Generator installs
- Furnace repairs and installs
- Boiler service
- Heat pumps
- Ductless mini-splits
Listed under Backup power, Basement flooding and sewer backup, Heating and cooling emergencies
Where they work
What we checked
Checked 12 Nov 2026, from public sources.
Not yet verified. We haven’t contacted this business yet. Ask for a written quote before work starts.
Other backup power pros in Appleton
Still choosing the equipment?
Compare prices and specs before you call a pro.