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

Local Reviews

Rated 5.0 out of 5 stars based on 82 customer reviews

Great service

We have been so pleased with Grenz Service! They are always so prompt when we call for service and their prices are very fair. Jim is honest, fair, and a great help! I would highly recommend Grenz Service.

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Great Service as always!

Grenz has been providing service in our homes since 1999 and we are very satisfied customers! They’ve done maintenance, installed new furnaces and air conditioners. All work has been top notch for 20 years.

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Great

I've used this company numerous times and have never been disappointed or overcharged....something that rarely happens any more. I very highly recommend them.

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Super customer service

Grenz returned our call quickly and was flexible on appointment set up. Was courteous, friendly and fixed our furnace fast!!

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Great service!

Very happy with the service!

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Great service. Responsive!

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This is the HVAC Team you want

This company is fantastic; they go above and beyond to do more than just sell an HVAC system but to make sure you get exactly what you need and are comfortable with the entire experience. Very friendly, professional and knowledgeable. We interviewed multiple companies before selecting Grenz and they were miles ahead of their competition on so many levels. Call them and give them a chance!

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Top Notch Service

Knowledgeable, honesty, Integrity, and trustworthy are not words I just throw around. Grenz earns all of them in spades. They have earned my business for as long as I have breath in my lungs. Call them, you won’t regret it.

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Did a great job!

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Quick response to service call

As normally occurs with Grenz Service Co, Jim was prompt with a response to a service call. Arrived to the site on time and found the vent blocking issue in a few minutes and corrected the problem

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Job Locations

James P. G.

James P. G. Job Checkin

Concord furnace repair

Concord furnace repair

James P. G.

James P. G. Job Checkin

Rheem furnace repair

Rheem furnace repair

James P. G.

James P. G. Job Checkin

American Standard modulating furnace install

American Standard modulating furnace install

James P. G.

James P. G. Job Checkin

Goodman furnace repair

Goodman furnace repair

James L. G.

James L. G. Job Checkin

Install blower in fireplace.

Install blower in fireplace.

James P. G.

James P. G. Job Checkin

Carrier furnace maintenance

Carrier furnace maintenance

James P. G.

James P. G. Job Checkin

Heil furnace repair

Heil furnace repair

James L. G.

James L. G. Job Checkin

Repair Majestic Fireplace.

Repair Majestic Fireplace.

James P. G.

James P. G. Job Checkin

Boiler check

Boiler check

James P. G.

James P. G. Job Checkin

Rheem furnace repair

Rheem furnace repair

James P. G.

James P. G. Job Checkin

American standard furnace install

American standard furnace install

James P. G.

James P. G. Job Checkin

Trane furnace repair

Trane furnace repair

James P. G.

James P. G. Job Checkin

True cooler repair

True cooler repair

James P. G.

James P. G. Job Checkin

Trane furnace repair

Trane furnace repair

James P. G.

James P. G. Job Checkin

Modify heater repair

Modify heater repair