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

Our Top Cities


Local Reviews
for oconomowoc, wi

Rated 5.0 out of 5 stars based on 18 customer reviews

Great service, very efficient!! Great guy!!

Excellent service!!

  • Overall Experience
  • Quality
  • Price
  • Convenience

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.

  • Overall Experience
  • Quality
  • Price
  • Convenience

FANTASTIC SERVICE

  • Overall Experience
  • Quality
  • Price
  • Convenience

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.

  • Overall Experience
  • Quality
  • Price
  • Convenience

Fast and efficient service.

  • Overall Experience
  • Quality
  • Price
  • Convenience

Amazing service, affordable price!

Jim came out to fix our fireplace that had stopped working. He was able to fix it quickly and at an affordable price. Sometimes having services coming into your home can be awkward, but he was very friendly and explained what the problem was and how he fixed it. Highly recommend Grenz Service!

  • Overall Experience
  • Quality
  • Price
  • Convenience

Trusted and professional

  • Overall Experience
  • Quality
  • Price
  • Convenience

Great service

Jim called me back very shortly after I had left a message. He was able to come out to my house the same day. He had been recommended by my son and I too would recommend him. My air conditioning was not working and Jim was able to fix it the same day because he explained that he carries these parts with him so his clients don’t have to wait. Especially in the recent humid days we are having

  • Overall Experience
  • Quality
  • Price
  • Convenience

Great service and price......

I called at 8 AM with a down AC unit and the service came out and it fixed in hour. Unbelievable response.....

  • Overall Experience
  • Quality
  • Price
  • Convenience

Great service

They responded to my concern immediately, were there quickly the day before a holiday, diagnosed and fixed the problem within minutes, good price. Definitely recommend. Family owned business.

  • Overall Experience
  • Quality
  • Price
  • Convenience

Great experience!

Great service, friendly, knowledgeable & trustworthy

  • Overall Experience
  • Quality
  • Price
  • Convenience

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.

  • Overall Experience
  • Quality
  • Price
  • Convenience

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.

  • Overall Experience
  • Quality
  • Price
  • Convenience

Extremely Responsive. Honest Work.

Contacted Grenz on a Sunday. Jim was back in touch within an hour. The problem was fixed the next day, after other contractors either didn’t know how to or didn’t want to repair. Or worse, they pushed to replace the furnace. This long time issue is now fixed and no longer a worry.

  • Overall Experience
  • Quality
  • Price
  • Convenience

Attentive Service!

Grenz has been our heating/cooling service provider of choice over the years. We own a 1800’s Victorian home where we find most home service providers flee. Jim and team are super friendly, consistent with great service and pricing is competitive. Thanks for updating both our heating and cooling systems, the new energy efficient systems are awesome!

  • Overall Experience
  • Quality
  • Price
  • Convenience

Job Locations
for oconomowoc, wi

James P. G.

James P. G. Job Checkin

Install

Install

James P. G.

James P. G. Job Checkin

Install unit heater

Install unit heater

James P. G.

James P. G. Job Checkin

Install unit heater


James P. G.

James P. G. Job Checkin

American Standard air conditioner install

American Standard air conditioner install

James P. G.

James P. G. Job Checkin

American standard ac repair

American standard ac repair

James P. G.

James P. G. Job Checkin

American standard system install

American standard system install

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

Rheem heat repair

Rheem heat repair

James L. G.

James L. G. Job Checkin

Repair fireplace.

Repair fireplace.

James L. G.

James L. G. Job Checkin

Service fireplace.

Service fireplace.

James P. G.

James P. G. Job Checkin

American Standard system install

American Standard system 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

Lennox air conditioner repair

Lennox air conditioner repair

James L. G.

James L. G. Job Checkin

Tuneup fireplace

Tuneup fireplace