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Best HVAC companies in Oconomowoc, WI

The highest-scoring HVAC company in and near Oconomowoc is On Time Heating & Cooling (score 81, 5.0 stars from 501 Google reviews). 6 companies meet the 5 Star standard within 25 km.

Last updated Sep 25, 2026How we rank
  1. 1

    On Time Heating & Cooling

    5.0 · 501 Google reviewsWaukesha, WI
    81SCORE
    (262) 671-8999 WebsiteFull profile
  2. 2

    Interstate Heating Co., Inc.

    4.9 · 1,072 Google reviewsSussex, WI
    80SCORE
    (262) 372-2772 WebsiteFull profile
  3. 3

    Cardinal Heating, Cooling, Plumbing & Electric

    5.0 · 353 Google reviewsSussex, WI
    80SCORE
    (262) 316-3780 WebsiteFull profile
  4. 4

    Seider Heating, Plumbing & Electrical

    4.8 · 386 Google reviewsWaukesha, WI
    71SCORE
    (262) 436-0505 WebsiteFull profile
  5. 5

    Jon Debelak Plumbing & Heating Inc

    4.8 · 210 Google reviewsSussex, WI
    67SCORE
    (262) 375-4460 WebsiteFull profile
  6. 6

    Droegkamp Furnace Co.

    4.9 · 62 Google reviewsPewaukee, WI
    65SCORE
    (262) 691-2444 WebsiteFull profile

We list only companies that clear our published bar, so this area is still filling in. As more HVAC companies near Oconomowoc qualify, they'll appear here automatically.

Compare the top 6

Top HVAC companies in Oconomowoc by 5 Star Score
#CompanyScoreGoogle ratingReviewsYearsBased in
1On Time Heating & Cooling815.0501–Waukesha
2Interstate Heating Co., Inc.804.91,072–Sussex
3Cardinal Heating, Cooling, Plumbing & Electric805.0353–Sussex
4Seider Heating, Plumbing & Electrical714.8386–Waukesha
5Jon Debelak Plumbing & Heating Inc674.8210–Sussex
6Droegkamp Furnace Co.654.962–Pewaukee

HVAC companies in Oconomowoc: quick answers

Who is the highest-rated HVAC company in Oconomowoc, WI?

On Time Heating & Cooling has the highest 5 Star Score among HVAC companies in and near Oconomowoc: 81 out of 100, with a 5.0 star Google rating from 501 reviews.

How many 5 Star HVAC companies serve Oconomowoc?

6 HVAC companies meet our standard within 25 km of Oconomowoc: at least a 4.5 star rating, 20 or more reviews and a score of 60 or higher. The top 6 have 2,584 Google reviews between them, averaging 4.90 stars.

How are these HVAC companies ranked?

By 5 Star Score: rating quality adjusted for review count (45 points), review volume (25), review recency (15), years in business (10) and license verification (5). Businesses cannot pay to change their score.

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Ratings and review counts come from each company's public Google listing and are re-checked monthly. 5 Star Home Service Pros is independent; companies cannot pay for placement.