318 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Greenfield: Thielmann Heating, Cooling & Plumbing, CR Score 65/100; 4.9★ from 1,665 Google reviews; open 24/7.
Best for emergencies (open 24/7): New Berlin Heating & Air Conditioning, posts 24/7 hours; ranked #2 of 318.
Most-reviewed: Roman Home Services - Electric, Plumbing, Heating & Cooling, 5,231 Google reviews at 4.9★, the most of 318 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
318 Greenfield HVAC contractors are ranked here by CR Score, from ten published factors. 133 are open 24/7, 195 open Saturdays and 165 open Sundays, based on posted hours. The median Google rating is 4.9★ across 318 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Thielmann Heating, Cooling & Plumbing | 65 | 4.9★ (1,665) | New Berlin, 6 mi away | 24/7 | Overall |
| 2 | New Berlin Heating & Air Conditioning | 65 | 4.9★ (1,158) | New Berlin, 5 mi away | 24/7 | Emergencies |
| 3 | Roman Home Services - Electric, Plumbing, Heating & Cooling | 64 | 4.9★ (5,231) | West Allis, 4 mi away | 24/7 | Most reviews |
| 4 | Mr. Holland's Home Services | 64 | 4.8★ (1,334) | New Berlin, 6 mi away | 24/7 | — |
| 5 | 1st Choice Heating & Cooling | 64 | 4.9★ (1,076) | Muskego, 9 mi away | 24/7 | — |
| 6 | Southport Home Services | 64 | 4.8★ (2,067) | Caledonia, 10 mi away | 24/7 | — |
| 7 | Third Coast HVAC, AC & Furnace Repair | 64 | 5.0★ (436) | Brookfield, 6 mi away | 24/7 | — |
| 8 | Heating and Cooling Drs of West Allis, Milwaukee and New Berlin LLC | 63 | 4.9★ (288) | Milwaukee, 2 mi away | 24/7 | — |
| 9 | Capital Heating, Cooling, Electric, and Plumbing | 63 | 4.7★ (2,977) | Menomonee Falls, 11 mi away | 24/7 | — |
| 10 | Quality Heating, Cooling, Plumbing & Electric | 63 | 4.9★ (1,113) | Brookfield, 10 mi away | 24/7 | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and trade focus: 4.9★ from 1,665 Google reviews, listed on Google as “HVAC contractor”.
Based in New Berlin, 5 mi away
Ranked #2 because of its Google rating and trade focus: 4.9★ from 1,158 Google reviews, listed on Google as “HVAC contractor”.
Based in West Allis, 4 mi away
Ranked #3 because of its Google rating and review volume: 4.9★ from 5,231 Google reviews, the most in Greenfield.
Based in New Berlin, 6 mi away
Ranked #4 because of its Google rating and trade focus: 4.8★ from 1,334 Google reviews, listed on Google as “HVAC contractor”.
Based in Muskego, 9 mi away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 1,076 Google reviews, listed on Google as “HVAC contractor”.
Based in Caledonia, 10 mi away
Ranked #6 because of its Google rating and trade focus: 4.8★ from 2,067 Google reviews, listed on Google as “HVAC contractor”.
Based in Brookfield, 6 mi away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 436 Google reviews, listed on Google as “HVAC contractor”.
Based in Milwaukee, 2 mi away
Ranked #8 because of its Google rating and trade focus: 4.9★ from 288 Google reviews, listed on Google as “HVAC contractor”.
Based in Menomonee Falls, 11 mi away
Ranked #9 because of its Google rating and trade focus: 4.7★ from 2,977 Google reviews, listed on Google as “HVAC contractor”.
Based in Brookfield, 10 mi away
Ranked #10 because of its Google rating and trade focus: 4.9★ from 1,113 Google reviews, listed on Google as “HVAC contractor”.
Based in Delafield, 20 mi away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 4,102 Google reviews, listed on Google as “HVAC contractor”.
Based in Wauwatosa, 5 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 247 Google reviews, listed on Google as “HVAC contractor”.
Based in Brookfield, 8 mi away
Ranked #13 because of its Google rating and trade focus: 4.9★ from 482 Google reviews, listed on Google as “HVAC contractor”.
Based in Milwaukee, 15 mi away
Ranked #14 because of its Google rating and trade focus: 4.8★ from 2,027 Google reviews, listed on Google as “HVAC contractor”.
Based in West Allis, 4 mi away
Ranked #15 because of its Google rating and trade focus: 4.9★ from 198 Google reviews, listed on Google as “HVAC contractor”.
Based in Oak Creek, 6 mi away
Ranked #16 because of its Google rating and trade focus: 4.7★ from 645 Google reviews, listed on Google as “HVAC contractor”.
Based in Oak Creek, 6 mi away
Ranked #17 because of its Google rating and trade focus: 4.9★ from 307 Google reviews, listed on Google as “HVAC contractor”.
Based in West Allis, 3 mi away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 176 Google reviews, listed on Google as “HVAC contractor”.
Based in Brookfield, 9 mi away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 383 Google reviews, listed on Google as “HVAC contractor”.
Based in Waukesha, 11 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 446 Google reviews, listed on Google as “HVAC contractor”.
Based in Brookfield, 8 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 222 Google reviews, listed on Google as “HVAC contractor”.
Based in Mukwonago, 17 mi away
Ranked #22 because of its Google rating and trade focus: 4.8★ from 2,376 Google reviews, listed on Google as “Air conditioning repair service”.
Based in South Milwaukee, 9 mi away
Ranked #23 because of its Google rating and trade focus: 4.9★ from 354 Google reviews, listed on Google as “HVAC contractor”.
Based in Waukesha, 10 mi away
Ranked #24 because of its Google rating and trade focus: 4.6★ from 1,249 Google reviews, listed on Google as “Furnace repair service”.
Based in Greenfield
Ranked #25 because of its Google rating and trade focus: 5.0★ from 59 Google reviews, listed on Google as “HVAC contractor”.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 318 ranked HVAC contractors here; the rest are on their profiles.
20 more HVAC contractors within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Best Heating And Air Conditioning | 2.5★ (2) | 9 mi |
| Blaine's Crane Service | 5.0★ (2) | 10 mi |
| Bredan Mechanical Systems | 5.0★ (2) | 12 mi |
| BUILDING REPAIR SERVICE INC - Heating & Cooling | 5.0★ (2) | 2 mi |
| Envira-Tech Inc | 4.0★ (2) | 12 mi |
| First Service | In Greenfield | |
| Francis Heating and Air Conditioning LLC | In Greenfield | |
| HVAC Bay Furnace & AC Repair | 5.0★ (2) | 13 mi |
| IMI LLC | 5.0★ (2) | 3 mi |
| Mack's Heating & Air Conditioning | 5.0★ (2) | 8 mi |
| Mequons Heating & Air Conditioning Installation | 5.0★ (2) | 10 mi |
| Pure Mecahnical | 5.0★ (2) | 11 mi |
| Quality Air Heating and Cooling LLC | Heating Repair and Diagnostic | 5.0★ (2) | 7 mi |
| R J Refrigeration Inc | 5.0★ (2) | 11 mi |
| Ramon Heating & A/C LLC | 5.0★ (1) | In Greenfield |
| RJ Heating and Air Conditioning LLC | 4.7★ (195) | 11 mi |
| Tempco Inc Heating & Air Conditioning | 4.5★ (2) | 12 mi |
| TMS Service | 4.5★ (2) | 6 mi |
| Trane Milwaukee Sales Office | 2.5★ (2) | 7 mi |
| Weatherization Services LLC | In Greenfield |
National price ranges in USD, not adjusted for Greenfield. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| AC replacement | $3,887 | $5,978 | $8,073 | Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range | October 2026 |
| Furnace replacement | $2,823 | $4,814 | $6,896 | Per system, installed; typical range of customer-reported jobs. US national range | October 2026 |
In Wisconsin, furnace and heat pump calls peak in the coldest winter weeks and AC calls in summer heat waves. Spring and fall are the easiest times to book maintenance or a replacement.
We scored 318 Greenfield HVAC contractors on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Greenfield data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |