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Furnace repair, air conditioning, heat pumps and HVAC service in Fond du Lac and nearby towns. 19 businesses listed, 6 with confirmed emergency service. Last checked September 2026.
Residential heating and cooling since 1997, with 24-hour emergency service.
Does: furnace installation, furnace repair, air conditioner install & repair, boiler maintenance, mini-split repair
Horicon heating and cooling company since 1947 with a Fond du Lac shop since 1992; furnace repair available 24/7.
Does: furnace repair & installation, air conditioner repair & installation, HVAC tune-ups, energy efficiency upgrades, indoor air quality
Serving Fond du Lac homes and businesses since 1990, with emergency service.
Does: furnace installation, furnace repair, air conditioner install & repair, HVAC maintenance
Heating and cooling company founded in 1951, with offices in Green Bay, Oshkosh and Fond du Lac.
Does: furnace repair, heat pump repair, air conditioner repair, HVAC installation
Family-owned Omro heating and cooling company since 1976, with 24-hour emergency service.
Does: furnace install & repair, air conditioner install & repair, indoor air quality, HVAC maintenance
Locally owned since 1941. Fuel and propane delivery plus furnace and AC repair and installs.
Does: furnace repair & installation, air conditioner repair & installation, HVAC tune-ups, hydronic heating, heating oil delivery
Oshkosh plumbing and heating contractor for more than 100 years, serving the Fox Valley and part of Fond du Lac County.
Does: furnace install & repair, air conditioner install & repair, boilers, heat pumps, ductless systems
Repairs all brands and installs everything from furnaces to geothermal systems.
Does: furnace repair & replacement, air conditioner repair & replacement, heat pumps, ductless mini-splits, geothermal
Heating, cooling and refrigeration service across Fond du Lac County.
Does: heating service, air conditioning service, refrigeration service
Fond du Lac air duct and dryer vent cleaning, plus mold remediation.
Does: air duct cleaning, dryer vent cleaning, mold remediation, allergen & dust removal
Owner-run plumbing and heating contractor on West 9th Street.
Does: plumbing repair, water heater repair, heating service
North Fond du Lac heating, cooling and water heater company with service 24 hours a day, weekends and holidays included.
Does: furnace repair & replacement, air conditioner repair & replacement, boilers, heat pumps, water heater repair & replacement
Fond du Lac County HVAC contractor, about 19 years in business.
Does: heating service, air conditioning service, commercial air conditioning
Plumbing and heating contractor in Fond du Lac, reportedly since 1991.
Does: plumbing service, heating service
Ripon heating and cooling contractor that serves Fond du Lac County and repairs most brands.
Does: furnace repair & installation, air conditioner repair & installation, HVAC replacement, HVAC maintenance
Mechanical contractor handling plumbing, drains, heating and cooling.
Does: plumbing, drain cleaning, heating, air conditioning, mechanical repair & installation
Above & Beyond Expectations Heating and Cooling, an Oshkosh HVAC company covering furnaces, boilers, heat pumps and AC.
Does: furnace sales, install & repair, boilers, heat pumps, air conditioner install & repair, indoor air quality
Waupun residential heating and cooling contractor.
Does: furnace install & repair, air conditioner install & repair, heat pumps, ductless systems, dual-fuel systems
Campbellsport air conditioning contractor.
Does: air conditioning
6 listed businesses confirm emergency or after-hours service on their own website: Air Tech Heating Inc., Sure-Fire, Inc., Ziegelbauer H.V.A.C., Martens Heating And Cooling, Fondy Heating & Air Conditioning Inc., E. C. Merrill, Inc.. Call to confirm they can come out when you need them.
This page lists 19. 12 are based in Fond du Lac or North Fond du Lac; the rest are based in nearby towns and say they serve the area.
7 listed businesses say they do: Air Tech Heating Inc., Wesley Heating & Cooling Inc., Kurt Zentner & Sons, Inc., Fondy Heating & Air Conditioning Inc., E. C. Merrill, Inc., A&BE Heating and Cooling, LLC, and 1 more on this page.
6 listed businesses say they do: Sure-Fire, Inc., Martens Heating And Cooling, Kurt Zentner & Sons, Inc., Fondy Heating & Air Conditioning Inc., Wisconsin Natural Air Duct Cleaning Fond du Lac, A&BE Heating and Cooling, LLC.
Brewer Heating, Inc. (5.0 stars, 1828 reviews); Air Tech Heating Inc. (4.8 stars, 617 reviews); Martens Heating And Cooling (4.9 stars, 566 reviews).
Merwin Oil Company LLC (since 1941); Sure-Fire, Inc. (since 1947); Wesley Heating & Cooling Inc. (since 1951).
By whether the business is based in Fond du Lac, years in business, confirmed emergency service, verified credentials like city pre-qualification or Focus on Energy Trade Ally status, review data, and how complete its verified details are. Paying never changes a business's position.