Advanced Custom Geothermal

Business Details

19 Years

experience

Emergency

services

Your Trusted HVAC & Geothermal Contractor in Wisconsin

Since 2007, Advanced Custom Geothermal has been a trusted provider of residential and commercial HVAC solutions in Wisconsin. Our expertise spans both traditional systems and energy-efficient geothermal technology, making us the state's leading WaterFurnace Geothermal contractor. We prioritize personalized service, offering tailored system designs that maximize energy savings and comfort. Our team of certified professionals brings decades of combined experience to every project, from new installations to emergency repairs. We maintain Geo Pro Master Dealer status, a distinction held by fewer than 5% of WaterFurnace dealers nationwide.

Customer satisfaction remains our top priority, as evidenced by our numerous five-star reviews and repeat clientele. We provide comprehensive energy analysis services to help clients understand their potential savings. Our commitment to quality extends to all HVAC components, including air conditioning units, furnaces, and indoor air quality solutions. We serve both homes and businesses, offering commercial refrigeration and architectural sheet metal fabrication services. With showrooms and service centers strategically located across Wisconsin, we ensure accessible, reliable support for all our clients.

Services

Geothermal Installation HVAC Repair Air Conditioning Service Commercial Refrigeration Duct Cleaning Furnace Installation Indoor Air Quality System Maintenance Energy Audits Refrigeration Services

Details

Year established: 2007

Highlights and features

Decades of combined HVAC expertise since 2007
Wisconsin's #1 WaterFurnace Geothermal contractor
Free personalized energy analysis available
Certified professionals for all HVAC systems
Proven energy savings with geothermal technology

Associations and certifications

WaterFurnace Geo Pro Master Dealer

What people say

Excellent employees Fantastic savings Works beautifully Highly recommend Very pleased

Website

Update Listing

Services

Geothermal Installation

We specialize in complete geothermal heating and cooling system installations using WaterFurnace technology. Our systems harness stable underground temperatures to reduce energy costs by up to 70% while maintaining optimal indoor comfort. Each installation includes site-specific design analysis to maximize efficiency for residential and commercial properties.

HVAC Repair

Our certified technicians provide prompt repair services for all HVAC systems including furnaces, air conditioners, and geothermal units. We offer diagnostic assessments and emergency repair options to minimize downtime while ensuring long-term system reliability through preventive maintenance programs.

Air Conditioning Service

We install and service residential and commercial air conditioning systems with energy-efficient models that improve indoor comfort. Our offerings include central AC units, ductless mini-splits, and air exchangers that maintain optimal temperature control while improving indoor air quality through advanced filtration systems.

Commercial Refrigeration

Our commercial refrigeration services cover walk-in coolers, ice machines, and freezers for businesses across Wisconsin. We provide complete installation, maintenance, and repair solutions tailored to food service operations, medical facilities, and industrial applications requiring precise temperature control environments.

Energy Analysis

We offer complimentary energy analysis services to evaluate current HVAC system performance and identify savings opportunities. Our assessment includes equipment evaluation, insulation analysis, and geothermal feasibility studies that help clients understand potential cost reductions through system upgrades or conversions.

People

Sean Steffes

Owner

Sean Steffes co-founded Advanced Custom Geothermal in 2007 and continues to lead HVAC operations. With over 15 years in the industry, he specializes in geothermal system design and has grown the company into Wisconsin's top WaterFurnace dealer while maintaining hands-on involvement in client projects.

Questions

What makes geothermal heating more efficient?

Geothermal systems use stable underground temperatures to heat and cool buildings, requiring 30-70% less energy than conventional HVAC systems by transferring heat rather than generating it through combustion.

Do you service traditional HVAC systems?

Yes, we provide installation, repair, and maintenance for all HVAC types including gas furnaces, air conditioners, and boilers alongside our geothermal offerings for residential and commercial clients.

Are there incentives for geothermal installation?

Wisconsin residents may qualify for federal tax credits, state rebates, and utility company incentives that can cover 30-50% of geothermal system costs, which our experts help clients navigate during consultations.

How long do geothermal systems last?

Geothermal heat pumps typically last 20-25 years with proper maintenance, while underground loops have a lifespan exceeding 50 years, making them a long-term investment in energy efficiency.

What areas do you service?

We serve residential and commercial clients across 24 Wisconsin communities including Appleton, Sheboygan, Fond du Lac, and Manitowoc, with our main office located in Kiel for easy access to eastern Wisconsin.

Can geothermal work with existing ductwork?

In most cases, geothermal heat pumps can integrate with existing duct systems after evaluation. Our technicians assess current infrastructure during site analysis to determine necessary modifications for optimal system performance.

Reviews (4)

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Alex Beaty

Nov 07, 2021 Report

Advanced Custom Geothermal has done good work on my Waterfurnace and provided great advice about specific issues. Very responsive and reasonable.

Travis Konz

May 19, 2019 Report

We recently moved into a new house, and our AC unit wasn't working properly. At our previous address we had Dan come out from Advanced Custom Geothermal to install an ac unit for us and we were very pleased. Fast forward to today, and Dan came back out to look at our ac unit. Not only did we receive once again, five star work, but Dan was so honest and personable! He remembered where I worked and everything, and it was over a year in a half since he last made a house call for us to troubleshoot and tell us our options. Turns out our ac unit had a bad wire, and Dan replaced it right away and got our ac up and working in a matter of a half hour! Very impressed with his friendliness and service! I will definitely recommend ACG to our friends and family!

Pierre Jacque

Dec 21, 2018 Report

I would be careful doing business with this company. I recently received machinary from Sean Steffens, one of the partners, that was presented as being in "good working order". Upon closer inspection, the machine does not operate properly, or at all. When I contacted him regarding the issue, he apologized but did not offer any remedy. Honesty and integrity are not priorities for the ownership of this business.

Deanna B.

Mar 11, 2018 Report

Dan and his crew have been wonderful to work with. This was the first geothermal unit we've installed, and were initially cautious about the price. However, Dan spent a lot of time adapting the entire system to fit our land and our needs, and detailing exactly how the system will save us money. The system works beautifully, and we're very happy with it. They've been very fast and friendly with response to any questions we've had since installation.

We also had an issue where someone flooded our laundry room, and they were out the next day to work on the clean-up where water had run down the cold air returns. Each of the guys we've worked with have been friendly, efficient, and happy to answer any questions we've had. Good job, guys!