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Best HVAC Contractors in Hermantown, MN (2026)

54 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Hermantown: ASP Mechanical, CR Score 67/100; 4.8★ from 1,645 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Stone Plumbing and Heating Inc., posts 24/7 hours; ranked #2 of 54.

  3. 15

    Most-reviewed: Aire Serv of Northeastern Minnesota, 427 Google reviews at 4.8★, the most of 54 ranked after ASP Mechanical; ranked #15.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

54 Hermantown HVAC contractors are ranked here by CR Score, from ten published factors. 14 are open 24/7, 18 open Saturdays and 18 open Sundays, based on posted hours. The median Google rating is 4.8★ across 54 rated businesses.

Most of this list also appears on the HVAC contractors in Duluth ranking. See HVAC contractors in Duluth

Top 10 HVAC contractors in Hermantown at a glance

Top 10 HVAC contractors in Hermantown at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1ASP Mechanical674.8★ (1,645)Duluth, 2 mi away24/7Overall
2Stone Plumbing and Heating Inc.634.9★ (395)Duluth, 10 mi away24/7Emergencies
3Veterans Heating & Cooling624.9★ (101)Duluth, 5 mi away24/7—
4NorthStar Heating and Cooling624.8★ (355)Duluth, 6 mi awaySat · Sun · Evenings—
5Cosgriff Climate Control615.0★ (32)Hermantown24/7—
6Plumbing and Heating Solutions Inc615.0★ (68)Duluth, 8 mi away24/7—
7A G O'Brien Plumbing & Heating Co614.8★ (362)Duluth, 2 mi away24/7—
8Advantage Air Plumbing, Heating, & Cooling604.6★ (48)Duluth, 3 mi away24/7—
9Advantage Air Plumbing, Heating and Cooling594.4★ (138)Superior, 9 mi away24/7—
10Northland Air595.0★ (46)Duluth, 13 mi away24/7—

The 54 best HVAC contractors in Hermantown, ranked

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.

  1. Ranked #1 in Hermantown

    #1 ASP Mechanical

    Based in Duluth, 2 mi away

    67/100CR Score

    Ranked #1 because of its Google rating and review volume: 4.8★ from 1,645 Google reviews, the most in Hermantown.

    • 4.8★ from 1,645 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    5028 Miller Trunk Hwy, Duluth, MN 55811
    View profile for ASP Mechanical(218) 203-9640

  10. #10 Northland Air

    Based in Duluth, 13 mi away

    59/100CR Score

    Ranked #10 because of its Google rating and trade focus: 5.0★ from 46 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 46 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for Northland Air(218) 520-9232

  14. #14 Superior Fuel Company

    Based in Superior, 9 mi away

    57/100CR Score

    Ranked #14 because of its Google rating and trade focus: 5.0★ from 154 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 154 Google reviews
    Hours
    Mon–Fri 8 AM–4:30 PM · Sat–Sun closed
    Address
    1330 Tower Ave, Superior, WI 54880
    View profile for Superior Fuel Company(218) 722-2050

  18. #18 Design Heating, LLC

    Based in Duluth, 11 mi away

    56/100CR Score

    Ranked #18 because of its Google rating and trade focus: 4.9★ from 101 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 101 Google reviews
    Hours
    Mon–Fri 7 AM–7 PM · Sat–Sun closed
    Address
    5131 Washburn Rd, Duluth, MN 55803
    View profile for Design Heating, LLC(218) 525-5914

  20. #20 Duluth HVAC Services

    Based in Duluth, 7 mi away

    55/100CR Score

    Ranked #20 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 6 Google reviews
    Hours
    Mon–Fri 7 AM–8 PM · Sat–Sun 9 AM–7 PM
    Address
    1025 Berwick Ct, Duluth, MN 55811
    View profile for Duluth HVAC Services(218) 321-9347

  22. #22 Superior Fuel Company

    Based in Duluth, 15 mi away

    55/100CR Score

    Ranked #22 because of its Google rating and trade focus: 4.5★ from 423 Google reviews, listed on Google as “HVAC contractor”.

    • 4.5★ from 423 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat–Sun closed
    Address
    5102 S Cant Rd, Duluth, MN 55804
    View profile for Superior Fuel Company(218) 722-2050

  23. #23 Honest HVAC

    Based in Duluth, 18 mi away

    55/100CR Score

    Ranked #23 because of its Google rating and trade focus: 5.0★ from 11 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 11 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for Honest HVAC(218) 343-3231

  24. #24 MMT Heating & Cooling

    Based in Duluth, 3 mi away

    54/100CR Score

    Ranked #24 because of its Google rating and trade focus: 4.7★ from 27 Google reviews, listed on Google as “HVAC contractor”.

    • 4.7★ from 27 Google reviews
    Hours
    Mon–Fri 8 AM–4:30 PM · Sat–Sun closed
    Address
    5501 Miller Trunk Hwy, Duluth, MN 55811
    View profile for MMT Heating & Cooling(218) 729-1585

HVAC contractors ranked #29 to #46

#1 to #25 are shown in full above. Here are #29 to #46, in CR Score order; each links to its profile. We publish the top 46 of 54 ranked HVAC contractors here; the rest are on their profiles.

HVAC contractors in Hermantown, ranks 29 to 46
RankBusinessCR ScoreGoogle ratingDistance
29Walstrom Heating And Air Conditioning Inc534.3★ (16)10 mi
31Randall's Heating & Cooling, Inc.534.3★ (6)6 mi
37Murph's Plumbing & Heating515.0★ (5)14 mi
46Lavoie Plumbing Inc.485.0★ (3)10 mi

How much do HVAC contractors cost in Hermantown?

National price ranges in USD, not adjusted for Hermantown. Each row names its basis and the month we checked it.

How much do HVAC contractors cost in Hermantown?
JobLowTypicalHighBasisChecked
AC replacement$3,887$5,978$8,073Per system, installed (unit plus labor); typical range of customer-reported jobs. US national rangeOctober 2026
Furnace replacement$2,823$4,814$6,896Per system, installed; typical range of customer-reported jobs. US national rangeOctober 2026

When to hire an HVAC contractor in Minnesota

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.

How we ranked Hermantown HVAC contractors

We scored 54 Hermantown 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn Hermantown data
Reputation25%Google star rating, adjusted for how many reviews back itMeasured
Credentials15%Active state license, bond and workers’ comp on fileNot yet collected
Review volume10%Number of Google reviews, compared with the most-reviewed business on the listMeasured
Recency5%Share of reviews from the last 12 monthsNot yet collected
Availability5%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%How clearly the business does this trade (its Google category and name)Measured
Proximity5%Based in the city scores highest, less the farther away it isMeasured
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)Measured
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodicallyMeasured
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there areMeasured

HVAC contractors in Hermantown: frequently asked questions

Who is the best HVAC contractor in Hermantown?

By CR Score, the highest-ranked HVAC contractor in Hermantown, MN is ASP Mechanical with a CR Score of 67/100. It has 4.8★ from 1,645 Google reviews. It is open 24/7. Stone Plumbing and Heating Inc. (#2) and Veterans Heating & Cooling (#3) follow. We ranked 54 HVAC contractors on ten factors, last updated October 22, 2026.

How many HVAC contractors are there in Hermantown?

ContractorsRanked ranks 54 HVAC contractors serving Hermantown, MN. 1 of them is based in Hermantown; the rest serve it from nearby towns. Counts are as of October 2026.

Which HVAC contractors in Hermantown are open 24/7?

14 ranked HVAC contractors in Hermantown post 24/7 hours. The highest-ranked are ASP Mechanical (#1), Stone Plumbing and Heating Inc. (#2) and Veterans Heating & Cooling (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which HVAC contractors in Hermantown work on weekends?

18 of 54 ranked HVAC contractors post Saturday hours and 18 post Sunday hours. The highest-ranked open Saturdays are ASP Mechanical (#1), Stone Plumbing and Heating Inc. (#2) and Veterans Heating & Cooling (#3). Posted hours are office hours; crews may book weekend jobs separately.

How much does ac replacement cost in Hermantown?

AC replacement typically costs $3,887 to $8,073, with $5,978 typical (Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range). This is a national range, not adjusted for Hermantown. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Hermantown HVAC contractors have?

The median Google rating among 54 rated HVAC contractors in Hermantown is 4.8★, with a median of 19 reviews. ASP Mechanical has the most, 1,645 reviews, and ranks #1. We adjust ratings for review count, so a few five-star reviews cannot top the list.

When is the best time to hire an HVAC contractor in Hermantown?

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.

How does ContractorsRanked rank HVAC contractors?

Each HVAC contractor gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.

Update log for Hermantown

  1. October 2026: CR Scores recalculated for 54 hvac contractors serving Hermantown.
  2. October 2026: 1 duplicate listing merged.

More HVAC contractors and Hermantown pages

Other trades in Hermantown