250 West Main St.
Delafield, WI 53018
262-646-3880

Local Reviews

Rated 5.0 out of 5 stars based on 162 customer reviews

First rate customer service.

Fast and efficient team with amazing customer service!!

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Marvelous company!

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The Best! Beyond trustworthy!

I’ve continued to use Grenz for several years and they never disappoint. Good, honest, hardworking, reliable and knowledgeable are just a few words I don’t just throw around. Jim and all of his employees are good people and beyond trustworthy. To say I trust them is an understatement. I don’t trust too many people. I trust Grenz in my home even if I’m not there. If that doesn’t say something, I don’t know what does. Thanks again Jim for all you’ve done for us!

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100% Confidence in them

Our air conditioner and furnace were 30 years old and both went out around the same time. Luckily my father in law gave me a good recommendation to call Grenz. He had hired them in the past and had great things to say. I can see why he said those things. They installed a brand new furnace and A/C all in one day. We got a quote from another company before hiring Grenz and they made no mention of needing to change and upgrade some of the duct work so that way our huge purchase isn’t hampered by the ducts. We then asked Grenz to give us a quote and I was so impressed with the attention to detail, use of actual math and measurements to determine what is needed for us, and the clarity it was communicated with so we could clearly understand what we need to do. I have 100% confidence they installed everything as well as you’d want a company to do. They were extremely courteous, smart, and professional. They also respond to any questions as quick as I’ve ever seen a company respond. The time in between the quote and actual install was super quick so that we weren’t left being sweaty and uncomfortable until they had time to do our job. Overall I have only great things to say about them and their work. It’s a father and son operation and you can clearly see that this is their life’s work based on the care and attention to detail. I’m glad we gave our business to them and will be giving it to them in the future for anything HVAC related.

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Excellent experience beginning to completion

On time, on budget, helpful, competent, efficient. Clearly a cut above.

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Great service, very efficient!! Great guy!!

Excellent service!!

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Great & Quick Service

We had our igniter go out in the middle of the night on a -14 degree day. Our house got very cold and I called Jim first thing in the morning and he was out right away fixing the issue. Would definitely use Jim again and highly recommend him.

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Polite, responsive service

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Great service!

Jim installed a new remote system for my gas fireplace. He was quick, knowledgeable and very friendly. I highly recommend Grenz.

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Awesome Service!

Professional, fast, thorough, and accurate! I highly recommend them for your fireplace servicing. Very knowledgable and efficient.

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Exceptional Service

Jim came out to tune up our 2 gas fireplaces yesterday. The service exceeded my expectations—found a small gas leak (yikes) & addressed it, replaced the starter (part was free) and Jim graciously shared is knowledge to help me maintain the fireplaces for the future. I definitely recommend Grenz Service.

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Great Service

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First time customer

I had my gas fireplace inspected and my furnace checked for the winter season. Jim and Bill were polite, skilled and did an excellent job. Bill caught a wiring issue on my humidifier that was not done correctly by the installer and never caught by the other company I had been using for my maintenance. I feel confident in getting a maintenance contract.

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VERY KNOWLEDGEABLE, HIGH QUALITY SERVICEJim

Jim answers the phone, gets back to you when promised.

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Great service

Great company!

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Job Locations

James P. G.

James P. G. Job Checkin

American Standard Install

American Standard Install

James P. G.

James P. G. Job Checkin

American Standard install

American Standard install

James P. G.

James P. G. Job Checkin

America Standard AC Install

America Standard AC Install

James P. G.

James P. G. Job Checkin

Thermostat install

Thermostat install

James P. G.

James P. G. Job Checkin

American Standard AC install

American Standard AC install

James P. G.

James P. G. Job Checkin

System install

System install

James P. G.

James P. G. Job Checkin

AC install

AC install

James P. G.

James P. G. Job Checkin

Ac maint

Ac maint

James P. G.

James P. G. Job Checkin

Maintenance

Maintenance

James P. G.

James P. G. Job Checkin

Thermostat reprogram

Thermostat reprogram

James P. G.

James P. G. Job Checkin

American Standard AC install

American Standard AC install

James P. G.

James P. G. Job Checkin

AC maintenance

AC maintenance

James P. G.

James P. G. Job Checkin

American standard install

American standard install

James L. G.

James L. G. Job Checkin

Service Fireplace

Service Fireplace

James P. G.

James P. G. Job Checkin

Walk in cooler repair

Walk in cooler repair