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

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Local Reviews

Rated 5.0 out of 5 stars based on 157 customer reviews

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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Friendly, professional service

Jim and his team replaced the a/c units in a timely and convenient manner. They are always friendly and explain in an easy to understand way. Very happy to recommend Grenz Service

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Great Service

Grenz Services identified issues with our furnace while conducting seasonal service checks and cleaning. They also identified a leak in our air conditioning system during the same visit. The technician helped setup a system review for the Spring of 2021. Grenz Services conducted an in home review of our heating and cooling needs and offered two options for us to choose from. Each option was explained in detail helping us to make an informed decision for our needs. They setup the installation and removal of the old system. The crew left our house cleaner than when they began the work. They were in and out in about 5.5 hours. I will recommend them to anyone that I know is looking for HVAC work.

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FANTASTIC SERVICE

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Furnace issue resolved quickly at a great price

I really appreciated the technicians honesty and accurate diagnostic skills. The work was done quickly and I now have heat again.

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Great service

Jim was able Fix are30-year-old gas fireplace and saved us a lot of money.Other companies quote a lot more money. Jim’s knowledge and personality is simply amazing

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Job Locations

James P. G.

James P. G. Job Checkin

Compressor replacement

Compressor replacement

James P. G.

James P. G. Job Checkin

American standard system install

American standard system install

James L. G.

James L. G. Job Checkin

Install new gas log system.

Install new gas log system.

James P. G.

James P. G. Job Checkin

Carrier furnace repair

Carrier furnace repair

James P. G.

James P. G. Job Checkin

Carrier furnace repair

Carrier furnace repair

James P. G.

James P. G. Job Checkin

True cooler repair

True cooler repair

James P. G.

James P. G. Job Checkin

Goodman furnace repair

Goodman furnace repair

James L. G.

James L. G. Job Checkin

Tune up Fireplace and test operation.

Tune up Fireplace and test operation.

James P. G.

James P. G. Job Checkin

Bryant furnace repair

Bryant furnace repair

James P. G.

James P. G. Job Checkin

Carrier furnace repair

Carrier furnace repair

James P. G.

James P. G. Job Checkin

Replace door closer on walk in cooler

Replace door closer on walk in cooler

James P. G.

James P. G. Job Checkin

Humidifier install

Humidifier install

James P. G.

James P. G. Job Checkin

Rheem heat repair

Rheem heat repair

James P. G.

James P. G. Job Checkin

Lennox furnace repair

Lennox furnace repair

James L. G.

James L. G. Job Checkin

Repair IPI controls on fireplace.

Repair IPI controls on fireplace.