58 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Duluth: ASP Mechanical, CR Score 96/100; 4.8★ from 1,645 Google reviews; open 24/7.
Best for emergencies (open 24/7): Stone Plumbing and Heating Inc., posts 24/7 hours; ranked #2 of 58.
Most-reviewed: Aire Serv of Northeastern Minnesota, 427 Google reviews at 4.8★, the most of 58 ranked after ASP Mechanical; ranked #29.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
58 Duluth HVAC contractors are ranked here by CR Score, from 8 published factors. 17 are open 24/7, 21 open Saturdays and 21 open Sundays, based on posted hours. The median Google rating is 4.8★ across 58 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | ASP Mechanical | 96 | 4.8★ (1,645) | Duluth | 24/7 | Overall |
| 2 | Stone Plumbing and Heating Inc. | 94 | 4.9★ (395) | Duluth | 24/7 | Emergencies |
| 3 | Veterans Heating & Cooling | 91 | 4.9★ (101) | Duluth | 24/7 | — |
| 4 | Plumbing and Heating Solutions Inc | 91 | 5.0★ (68) | Duluth | 24/7 | — |
| 5 | Premier Plumbing and Heating LLC | 90 | 4.9★ (65) | Duluth | 24/7 | — |
| 6 | Northland Air | 90 | 5.0★ (46) | Duluth | 24/7 | — |
| 7 | NorthStar Heating and Cooling | 89 | 4.8★ (355) | Duluth | Sat · Sun · Evenings | — |
| 8 | A G O'Brien Plumbing & Heating Co | 89 | 4.8★ (362) | Duluth | 24/7 | — |
| 9 | Advantage Air Plumbing, Heating, & Cooling | 88 | 4.6★ (48) | Duluth | 24/7 | — |
| 10 | Advantage Air Plumbing, Heating and Cooling | 87 | 4.4★ (138) | Superior, 5 mi away | 24/7 | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and review volume: 4.8★ from 1,645 Google reviews, the most Google reviews on this list (1,645).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #2 because of its Google rating and availability: 4.9★ from 395 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #3 because of its Google rating and availability: 4.9★ from 101 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #4 because of its Google rating and availability: 5.0★ from 68 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #5 because of its Google rating and availability: 4.9★ from 65 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #6 because of its Google rating and availability: 5.0★ from 46 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #7 because of its Google rating and trade focus: 4.8★ from 355 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #8 because of its Google rating and availability: 4.8★ from 362 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #9 because of its Google rating and availability: 4.6★ from 48 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Superior, 5 mi away
Ranked #10 because of its Google rating and availability: 4.4★ from 138 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hermantown, 8 mi away
Ranked #11 because of its Google rating and availability: 5.0★ from 32 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #12 because of its Google rating and availability: 5.0★ from 11 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Superior, 4 mi away
Ranked #13 because of its Google rating and availability: 4.4★ from 63 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #14 because of its Google rating and availability: 5.0★ from 23 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Cloquet, 17 mi away
Ranked #15 because of its Google rating and availability: 5.0★ from 21 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #16 because of its Google rating and availability: 2.7★ from 3 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Cloquet, 15 mi away
Ranked #17 because of its Google rating and availability: 4.4★ from 40 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #18 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #19 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Heating contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Duluth
Ranked #20 because of its Google rating and trade focus: 4.9★ from 101 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Duluth
Ranked #21 because of its Google rating and trade focus: 4.3★ from 6 Google reviews, listed on Google as “Heating contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Duluth
Ranked #22 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Superior, 4 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 154 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Superior, 6 mi away
Ranked #24 because of its Google rating and trade focus: 4.3★ from 16 Google reviews, listed on Google as “HVAC contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Duluth
Ranked #25 because of its Google rating and trade focus: 4.5★ from 423 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
#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 58 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 |
|---|---|---|
| Adolfson & Peterson Construction | 3.0★ (2) | In Duluth |
| All Season Experts | In Duluth | |
| AW Kuettel & Sons, Inc. | 5.0★ (3) | In Duluth |
| Carlson Bros Mechanical Contracting | 3.5★ (12) | In Duluth |
| Gartner Refrigeration Company - Duluth | 5.0★ (2) | In Duluth |
| GB Dyer Vent Cleaning And Air Duct Cleaning Services | 3.7★ (9) | In Duluth |
| Harbor Mechanical Inc | 4.8★ (98) | In Duluth |
| Letourneau Heating & Refrigeration LLC | 5.0★ (1) | In Duluth |
| Northern Heating & Plumbing | In Duluth | |
| Northside Mechanical Group | 5.0★ (1) | In Duluth |
| Optimum Energy Group | 4.8★ (107) | In Duluth |
| P&R Plumbing & Heating INC. | 5.0★ (2) | In Duluth |
| Plaunt Plumbing & Heating | 5.0★ (1) | In Duluth |
| ProTech Heating and Cooling | In Duluth | |
| Scott Mechanical llc | 5.0★ (1) | In Duluth |
| Sears Heating and Air Conditioning | 1.0★ (1) | In Duluth |
| SERVPRO of Aitkin, Carlton & West St. Louis Counties | 4.9★ (49) | In Duluth |
| Shubitz Plumbing & Heating | 3.4★ (37) | In Duluth |
| Stanley Steemer | 4.5★ (57) | In Duluth |
| UA Local 11 | 4.6★ (41) | In Duluth |
National price ranges in USD, not adjusted for Duluth. 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 Minnesota, 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 58 Duluth HVAC contractors on 8 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. Unknown factors are left out of the score, 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 Duluth data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |