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ContractorsRanked

Best HVAC Contractors in Round Lake, IL (2026)

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

The short answer

  1. 1

    Best overall in Round Lake: Black Diamond Plumbing & Mechanical Inc., CR Score 92/100; 4.9★ from 6,580 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Duane Blanton Plumbing, Sewer, Heating & Cooling, posts 24/7 hours; ranked #2 of 683.

  3. 5

    Most-reviewed: ABC Plumbing, Sewer, Heating, Cooling & Electric, 22,524 Google reviews at 4.7★, the most of 683 ranked; ranked #5.

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

683 Round Lake HVAC contractors are ranked here by CR Score, from 8 published factors. 310 are open 24/7, 521 open Saturdays and 420 open Sundays, based on posted hours. The median Google rating is 4.9★ across 683 rated businesses.

Top 10 HVAC contractors in Round Lake at a glance

Top 10 HVAC contractors in Round Lake at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Black Diamond Plumbing & Mechanical Inc.924.9★ (6,580)McHenry, 11 mi away24/7Overall
2Duane Blanton Plumbing, Sewer, Heating & Cooling924.7★ (2,290)Round Lake24/7Emergencies
3Precision Today Plumbing Heating Cooling Electrical (Miller's Area Heating)914.8★ (986)Grayslake, 3 mi away24/7—
4Command Service Center, INC905.0★ (745)Antioch, 9 mi away24/7—
5ABC Plumbing, Sewer, Heating, Cooling & Electric904.7★ (22,524)Arlington Heights, 16 mi away24/7Most reviews
6Cahill Heating, Cooling, Electric, Plumbing & Sewer905.0★ (1,064)Lake Bluff, 11 mi away24/7—
7Allied Air Conditioning & Heating Corp.905.0★ (428)Libertyville, 7 mi away24/7—
8TopTec Heating, Cooling, Plumbing & Electrical904.8★ (2,018)Libertyville, 9 mi away24/7—
9Comfort Cavalry Heating & Air904.9★ (1,086)Antioch, 10 mi away24/7—
10Premier Comfort Heating & Cooling LLC904.9★ (371)Fox Lake, 5 mi away24/7—

The 683 best HVAC contractors in Round Lake, ranked

Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.

Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  13. #13 AA Service Co.

    Based in Northbrook, 19 mi away

    89/100CR Score

    Ranked #13 because of its Google rating and availability: 4.9★ from 3,150 Google reviews, open 24/7.

    • 4.9★ from 3,150 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    550 Anthony Trail, Northbrook, IL 60062
    View profile for AA Service Co.(847) 729-7889

HVAC contractors ranked #26 to #50

#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 683 ranked HVAC contractors here; the rest are on their profiles.

HVAC contractors in Round Lake, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Air Kings Heating And Cooling884.9★ (259)9 mi
27Optimized Air885.0★ (72)4 mi
28Rellaire Smart Home Systems884.9★ (472)12 mi
29Ireland Heating & Air Conditioning Co.884.9★ (397)11 mi
30Mr. Heating and Cooling Inc885.0★ (283)13 mi
31Duane Blanton Plumbing, Sewer, Heating & Cooling884.9★ (105)5 mi
32Four Seasons Heating, Air Conditioning, Plumbing, Electric884.7★ (2,787)15 mi
33Active Heating & Cooling884.9★ (74)3 mi
34Althoff Home Services884.8★ (1,043)14 mi
35On The Mark Heating and Air885.0★ (939)20 mi
36STVU Inc885.0★ (79)6 mi
37Aire Serv of Palatine884.9★ (766)16 mi
38Woodstock Heating, Cooling & Electrical884.9★ (1,222)18 mi
39Beckman Bros., Inc884.8★ (119)4 mi
40Comfort Doctors heating and Cooling Inc884.9★ (158)8 mi
41Legacy Home Services884.9★ (571)15 mi
42Five Star Heating & Air, Inc.874.9★ (1,082)19 mi
43WeatherWise Heating & AC repair874.8★ (744)13 mi
44Com24 Heating & Air Conditioning LLC874.9★ (338)13 mi
45Next Generation Heating & Cooling875.0★ (285)15 mi
46Triple Tech Services874.8★ (232)8 mi
47Azrikam The Price Is Right Heating & Air Conditioning HVAC875.0★ (697)21 mi
48FloRyte Services875.0★ (340)17 mi
49GSHA Services, LTD874.9★ (747)18 mi
50JNL Climate Control, Inc.874.9★ (820)18 mi

Also serving Round Lake

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.

Unranked HVAC contractors serving Round Lake
BusinessGoogle ratingDistance
A & J General5.0★ (2)17 mi
Airzone Experts Inc.In Round Lake
Alex’s Duct Cleaning5.0★ (269)13 mi
Anthonys Heating & Air3.0★ (2)8 mi
Azteca Mechanical & Electrical Services5.0★ (1)In Round Lake
Bill's Heating and Cooling Service5.0★ (2)9 mi
Eagle Refrigeration Service4.5★ (2)11 mi
Four Seasons Heating, Air Conditioning, Plumbing, & Electric4.8★ (506)13 mi
GO GREEN Heating & Cooling5.0★ (2)10 mi
Kern Heating & Cooling Co.4.7★ (1,162)13 mi
Kwik Serv Plumbing, Heating & Cooling4.6★ (697)9 mi
Magic HVAC Inc5.0★ (2)12 mi
Mannina Creations5.0★ (2)9 mi
OVERALL HVAC LLC.3.0★ (2)16 mi
Ray's Heating & Cooling3.0★ (2)13 mi
Sway AirIn Round Lake
Thermal Mechanical Inc.3.0★ (2)5 mi
TM HVAC contractor5.0★ (2)11 mi
Vita HVAC Services5.0★ (2)9 mi
Weatherwise Heating & Air Conditioning5.0★ (2)12 mi

How much do HVAC contractors cost in Round Lake?

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

How much do HVAC contractors cost in Round Lake?
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 Illinois

In Illinois, 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 Round Lake HVAC contractors

We scored 683 Round Lake 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn Round Lake data
Reputation35%Bayesian-adjusted Google star ratingMeasured
Credentials15%Active state license 0.6, bond 0.2, workers’ comp 0.2Not yet collected
Review volume10%log10(reviews + 1) against the list maximumMeasured
Recency10%Share of reviews from the last 12 monthsNot yet collected
Availability10%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%Google main category 1.0, business name 0.7, additional category 0.5Measured
Proximity5%1.0 when based in the city, falling to 0 at the trade’s radiusMeasured
Completeness5%Website, photos, description, hours, claimed profile (0.2 each)Measured

HVAC contractors in Round Lake: frequently asked questions

Who is the best HVAC contractor in Round Lake?

By CR Score, the highest-ranked HVAC contractor in Round Lake, IL is Black Diamond Plumbing & Mechanical Inc. with a CR Score of 92/100. It has 4.9★ from 6,580 Google reviews. It is open 24/7. Duane Blanton Plumbing, Sewer, Heating & Cooling (#2) and Precision Today Plumbing Heating Cooling Electrical (Miller's Area Heating) (#3) follow. We ranked 683 HVAC contractors on 8 factors, last updated October 22, 2026.

How many HVAC contractors are there in Round Lake?

ContractorsRanked ranks 683 HVAC contractors serving Round Lake, IL. 1 of them is based in Round Lake; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.

Which HVAC contractors in Round Lake are open 24/7?

310 ranked HVAC contractors in Round Lake post 24/7 hours. The highest-ranked are Black Diamond Plumbing & Mechanical Inc. (#1), Duane Blanton Plumbing, Sewer, Heating & Cooling (#2) and Precision Today Plumbing Heating Cooling Electrical (Miller's Area Heating) (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which HVAC contractors in Round Lake work on weekends?

521 of 683 ranked HVAC contractors post Saturday hours and 420 post Sunday hours. The highest-ranked open Saturdays are Black Diamond Plumbing & Mechanical Inc. (#1), Duane Blanton Plumbing, Sewer, Heating & Cooling (#2) and Precision Today Plumbing Heating Cooling Electrical (Miller's Area Heating) (#3). Posted hours are office hours; crews may book weekend jobs separately.

How much does ac replacement cost in Round Lake?

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 Round Lake. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Round Lake HVAC contractors have?

The median Google rating among 683 rated HVAC contractors in Round Lake is 4.9★, with a median of 24 reviews. ABC Plumbing, Sewer, Heating, Cooling & Electric has the most, 22,524 reviews, and ranks #5. 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 Round Lake?

In Illinois, 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 8 published factors, led by reputation (35%), credentials (15%), review volume (10%) and recency (10%). Factors we cannot measure are left out, not scored as zero. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.

Update log for Round Lake

  1. October 2026: CR Scores recalculated for 683 hvac contractors serving Round Lake.
  2. October 2026: 6 duplicate listings merged.

More HVAC contractors and Round Lake pages

Other trades in Round Lake