J.F. Ahern Co.
HVAC
Serving Fond du Lac, WI
From Google Business Profile
4.6
38 Google reviews
Hours
| Monday | 7:30 AM–4:30 PM |
| Tuesday | 7:30 AM–4:30 PM |
| Wednesday | 7:30 AM–4:30 PM |
| Thursday | 7:30 AM–4:30 PM |
| Friday | 7:30 AM–4:30 PM |
| Saturday | Closed |
| Sunday | Closed |
Google categories: Mechanical contractor, Fire protection service
View on Google Maps →Last checked October 24, 2026.
More from Google Business Profile
Listed features
- Accessibility
- Wheelchair accessible entrance
- Wheelchair accessible parking lot
Photos on Google: 14
Recent Google reviews (excerpts)
Written by Google users, not by EdgeLocal. EdgeLocal has not verified them and does not show reviewer names.
5 out of 5 stars · Feb 2026
Wonderful experience with the staff.
1 out of 5 stars · Jan 2026
Impatient driver in an accident zone,,had to pull all the way up in the merging lane and then cut me off!!! Truck 626.....Are your drivers aware your name is on the truck? What a J-off!!!!
3 out of 5 stars · Sep 2022
Have train units that were installed a year and a half ago that do not run properly to this very day have had warranty Work rescheduled five times with absolutely no notification as to it being rescheduled until after the day that it was…
The owner replied to 0 of the 5 most recent reviews Google showed.
From Google Business Profile, last checked October 24, 2026.
About hvac contractors in Fond du Lac
HVAC contractors install, service and repair furnaces, air conditioners, heat pumps and ductwork. HVAC contractors replace furnaces and central air conditioners, install heat pumps and ductless mini-splits, perform seasonal tune-ups, seal and balance ductwork, add humidifiers and air filtration, and respond to no-heat emergencies.
Typical cost: $5,500–$14,000 for a furnace or central AC replacement. See the full cost guide
Typical U.S. ranges from industry sources (2024–25); not EdgeLocal data. Your quote will vary with scope, materials and location.
Questions to ask this contractor
- Ask for a load calculation: A Manual J calculation sizes equipment for your actual home.
- Compare equipment line by line: Match model numbers, efficiency ratings and warranty terms across quotes.
- Verify mechanical licensing: Iowa and several neighboring states license HVAC/mechanical work.