Your American Standard Customer Care Dealer

There are a lot of companies that do what we do—repair, maintain, and install HVAC equipment. But, there are few with as many longstanding, loyal customers! We’re glad to be the heating company so many people in Delafield, Oconomowoc and Pewaukee know and trust.
Our philosophy is simple: we treat our customers the way we'd like to be treated. Before starting work, we educate you as to your options and potential costs of your furnace repair or furnace replacement. We show our respect by showing up on time, being prepared, doing quality work, and treating your home as if it was our own. When we’re done, you pay what was agreed upon up front and can count on us stand behind our work. When you couple that with our dedication to our customers, why would anyone in the Delafield area go anywhere else? — If we’re the kind of HVAC company you’re looking for, give us a call or send us an email to tell us more about your heating problem!
Grenz Service Company, LLC works with American Standard Furnaces in Oconomowoc WI.


Should your Furnace break down and need emergency service, you’ll be glad to know we are reachable after hours and are familiar with most every brand of equipment made. Our experienced, highly-trained HVAC technicians can quickly discover why you need a furnace repair and fix the problems plaguing your Heating system.


Like your car, your home’s mechanical systems work longest and best when they receive regular maintenance. Being proactive is smart—it maintains fuel efficiency, helps prevent unplanned surprises, and maximizes the life of your Furnace. When you call, ask how our maintenance programs can help you save money on your Heating bills in the Oconomowoc area.


Not sure if you should invest in a costly Furnace repair or just replace your equipment? We take the time to educate you, present options, and answer your questions so you can decide what’s best for your budget. It’s your home, your money, and your choice. We fully respect that.

Cities We Service

A proud American Standard Comfort Care dealer in Delafield WI


What does it mean to be a Customer Care Dealer? American Standard has partnered with Grenz Service Company, LLC in a promise to always bring excellence to the table. Our technicians are always being trained and exposed to the newest and most innovative HVAC equipment so that we can give expert knowledge and help deliver the best solution for you!
A proud American Standard Comfort Care dealer in Oconomowoc WI

Frequently Asked Questions

How Long Do
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AC Service Cost?
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Energy Star Partner
Focus on Energy partnering with WI utilities.
RSES HVACR training authority.
Hashizaki American, Inc.
US Cooler
Grenz Service Company, LLC is an HVAC company located in Delafield, Wisconsin. Grenz Service Company, LLC employs only the best HVAC technicians for your AC and furnace repairs or replacements. We proudly service Pewaukee, Delafield, and Oconomowoc. Rest assured, when you ask for "a good Heating company near me", you've come to the right place. To get a quote on your next furnace repair or replacement, call (262) 646-3880. Grenz Service Co. services all HVAC equipment brands including Coleman, Carrier, Bryant, Payne, Trane, Lennox, Rheem, Ruud, Amana, Daikin, Mitsubishi, Fujitsu, Crown, Frigidaire, Gibson, Goodman, Lochinvar, Maytag, Weil McLain, A O Smith, Kohler, American Standard, GeoExcel, General, Aprilaire, Honeywell, Rodgers, Dynamic and Skuttle.
Grenz Service Company, LLC
250 West Main St.
Delafield, WI 53018
Monday - Friday: 8AM - 5:00 PM
24 Hour Emergency Service Available
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For Furnace repair in Delafield WI, we accept most major credit cards.