710 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Grayslake: Precision Today Plumbing Heating Cooling Electrical (Miller's Area Heating), CR Score 64/100; 4.8★ from 986 Google reviews; open 24/7.
Best for emergencies (open 24/7): Black Diamond Plumbing & Mechanical Inc., posts 24/7 hours; ranked #2 of 710.
Most-reviewed: ABC Plumbing, Sewer, Heating, Cooling & Electric, 22,524 Google reviews at 4.7★, the most of 710 ranked; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
710 Grayslake HVAC contractors are ranked here by CR Score, from ten published factors. 325 are open 24/7, 548 open Saturdays and 445 open Sundays, based on posted hours. The median Google rating is 4.9★ across 710 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Precision Today Plumbing Heating Cooling Electrical (Miller's Area Heating) | 64 | 4.8★ (986) | Grayslake | 24/7 | Overall |
| 2 | Black Diamond Plumbing & Mechanical Inc. | 63 | 4.9★ (6,580) | McHenry, 13 mi away | 24/7 | Emergencies |
| 3 | Duane Blanton Plumbing, Sewer, Heating & Cooling | 63 | 4.7★ (2,290) | Round Lake, 3 mi away | 24/7 | — |
| 4 | ABC Plumbing, Sewer, Heating, Cooling & Electric | 63 | 4.7★ (22,524) | Arlington Heights, 15 mi away | 24/7 | Most reviews |
| 5 | TopTec Heating, Cooling, Plumbing & Electrical | 63 | 4.8★ (2,018) | Libertyville, 6 mi away | 24/7 | — |
| 6 | Cahill Heating, Cooling, Electric, Plumbing & Sewer | 63 | 5.0★ (1,064) | Lake Bluff, 8 mi away | 24/7 | — |
| 7 | Allied Air Conditioning & Heating Corp. | 63 | 5.0★ (428) | Libertyville, 5 mi away | 24/7 | — |
| 8 | Command Service Center, INC | 62 | 5.0★ (745) | Antioch, 10 mi away | 24/7 | — |
| 9 | Comfort Cavalry Heating & Air | 62 | 4.9★ (1,086) | Antioch, 11 mi away | 24/7 | — |
| 10 | Herchenbach Mechanical Inc. | 62 | 4.9★ (576) | Gurnee, 8 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 in Grayslake
Based in Grayslake
Ranked #1 because of its Google rating and trade focus: 4.8★ from 986 Google reviews, listed on Google as “HVAC contractor”.
Based in McHenry, 13 mi away
Ranked #2 because of its Google rating and trade focus: 4.9★ from 6,580 Google reviews, listed on Google as “HVAC contractor”.
Based in Round Lake, 3 mi away
Ranked #3 because of its Google rating and trade focus: 4.7★ from 2,290 Google reviews, listed on Google as “HVAC contractor”.
Based in Arlington Heights, 15 mi away
Ranked #4 because of its Google rating and review volume: 4.7★ from 22,524 Google reviews, the most in Grayslake.
Based in Libertyville, 6 mi away
Ranked #5 because of its Google rating and trade focus: 4.8★ from 2,018 Google reviews, listed on Google as “HVAC contractor”.
Based in Lake Bluff, 8 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 1,064 Google reviews, listed on Google as “HVAC contractor”.
Based in Libertyville, 5 mi away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 428 Google reviews, listed on Google as “HVAC contractor”.
Based in Antioch, 10 mi away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 745 Google reviews, listed on Google as “HVAC contractor”.
Based in Antioch, 11 mi away
Ranked #9 because of its Google rating and trade focus: 4.9★ from 1,086 Google reviews, listed on Google as “HVAC contractor”.
Based in Gurnee, 8 mi away
Ranked #10 because of its Google rating and trade focus: 4.9★ from 576 Google reviews, listed on Google as “HVAC contractor”.
Based in Northbrook, 17 mi away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 3,150 Google reviews, listed on Google as “HVAC contractor”.
Based in Libertyville, 4 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 165 Google reviews, listed on Google as “HVAC contractor”.
Based in Mundelein, 8 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 292 Google reviews, listed on Google as “HVAC contractor”.
Based in Fox Lake, 7 mi away
Ranked #14 because of its Google rating and trade focus: 4.9★ from 371 Google reviews, listed on Google as “HVAC contractor”.
Based in Grayslake
Ranked #15 because of its Google rating and trade focus: 4.8★ from 119 Google reviews, listed on Google as “HVAC contractor”.
Based in Mundelein, 7 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 234 Google reviews, listed on Google as “HVAC contractor”.
Based in Buffalo Grove, 13 mi away
Ranked #17 because of its Google rating and trade focus: 4.7★ from 2,787 Google reviews, listed on Google as “HVAC contractor”.
Based in Wauconda, 7 mi away
Ranked #18 because of its Google rating and trade focus: 4.8★ from 420 Google reviews, listed on Google as “HVAC contractor”.
Based in Lake Forest, 9 mi away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 397 Google reviews, listed on Google as “HVAC contractor”.
Based in Lake Zurich, 10 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 320 Google reviews, listed on Google as “HVAC contractor”.
Based in Mundelein, 7 mi away
Ranked #21 because of its Google rating and trade focus: 4.9★ from 259 Google reviews, listed on Google as “HVAC contractor”.
Based in Lake in the Hills, 16 mi away
Ranked #22 because of its Google rating and trade focus: 4.9★ from 1,374 Google reviews, listed on Google as “HVAC contractor”.
Based in Rolling Meadows, 18 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 1,104 Google reviews, listed on Google as “HVAC contractor”.
Based in Elgin, 21 mi away
Ranked #24 because of its Google rating and trade focus: 4.9★ from 3,222 Google reviews, listed on Google as “HVAC contractor”.
Based in Antioch, 10 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 235 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 710 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 |
|---|---|---|
| Air Blue Heating and Cooling | 4.8★ (684) | 15 mi |
| Anthonys Heating & Air | 3.0★ (2) | 10 mi |
| Bill's Heating and Cooling Service | 5.0★ (2) | 11 mi |
| Eagle Refrigeration Service | 4.5★ (2) | 14 mi |
| Four Seasons Heating, Air Conditioning, Plumbing, & Electric | 4.8★ (506) | 13 mi |
| Furnace & Heating (NEAR ME) | 5.0★ (2) | 16 mi |
| G&G vargas | 5.0★ (2) | 3 mi |
| GFM Home Services, Inc. | 1.0★ (1) | In Grayslake |
| GO GREEN Heating & Cooling | 5.0★ (2) | 7 mi |
| HeatForce Furnace Repair HVAC | 5.0★ (2) | 16 mi |
| Indoor Weather | 5.0★ (2) | 15 mi |
| Magic HVAC Inc | 5.0★ (2) | 14 mi |
| Mannina Creations | 5.0★ (2) | 9 mi |
| OVERALL HVAC LLC. | 3.0★ (2) | 14 mi |
| Ray's Heating & Cooling | 3.0★ (2) | 10 mi |
| Thermal Mechanical Inc. | 3.0★ (2) | 3 mi |
| TM HVAC contractor | 5.0★ (2) | 11 mi |
| Vita HVAC Services | 5.0★ (2) | 10 mi |
| WeatherWise Heating & AC repair | 4.8★ (744) | 15 mi |
| Weatherwise Heating & Air Conditioning | 5.0★ (2) | 10 mi |
National price ranges in USD, not adjusted for Grayslake. 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 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.
We scored 710 Grayslake 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 Grayslake 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 |