928 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Cary: Black Diamond Plumbing & Mechanical Inc., CR Score 65/100; 4.9★ from 6,580 Google reviews; open 24/7.
Best for emergencies (open 24/7): 24HR Home Comfort Services, posts 24/7 hours; ranked #2 of 928.
Most-reviewed: ABC Plumbing, Sewer, Heating, Cooling & Electric, 22,524 Google reviews at 4.7★, the most of 928 ranked; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
928 Cary HVAC contractors are ranked here by CR Score, from ten published factors. 417 are open 24/7, 690 open Saturdays and 574 open Sundays, based on posted hours. The median Google rating is 4.9★ across 928 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Black Diamond Plumbing & Mechanical Inc. | 65 | 4.9★ (6,580) | McHenry, 7 mi away | 24/7 | Overall |
| 2 | 24HR Home Comfort Services | 64 | 4.9★ (1,374) | Lake in the Hills, 3 mi away | 24/7 | Emergencies |
| 3 | Lifeline Plumbing, Heating & Cooling | 64 | 4.9★ (3,222) | Elgin, 8 mi away | 24/7 | — |
| 4 | ABC Plumbing, Sewer, Heating, Cooling & Electric | 63 | 4.7★ (22,524) | Arlington Heights, 14 mi away | 24/7 | Most reviews |
| 5 | Althoff Home Services | 63 | 4.8★ (1,043) | Crystal Lake, 3 mi away | 24/7 | — |
| 6 | Com24 Heating & Air Conditioning LLC | 63 | 4.9★ (338) | Cary | 24/7 | — |
| 7 | Legacy Home Services | 62 | 4.9★ (571) | Crystal Lake, 4 mi away | 24/7 | — |
| 8 | Rellaire Smart Home Systems | 62 | 4.9★ (472) | Crystal Lake, 4 mi away | 24/7 | — |
| 9 | JNL Climate Control, Inc. | 62 | 4.9★ (820) | Huntley, 7 mi away | 24/7 | — |
| 10 | WeatherWise Heating & AC repair | 62 | 4.8★ (744) | Crystal Lake, 4 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 6,580 Google reviews, listed on Google as “HVAC contractor”.
Based in Lake in the Hills, 3 mi away
Ranked #2 because of its Google rating and trade focus: 4.9★ from 1,374 Google reviews, listed on Google as “HVAC contractor”.
Based in Elgin, 8 mi away
Ranked #3 because of its Google rating and trade focus: 4.9★ from 3,222 Google reviews, listed on Google as “HVAC contractor”.
Based in Arlington Heights, 14 mi away
Ranked #4 because of its Google rating and review volume: 4.7★ from 22,524 Google reviews, the most in Cary.
Based in Crystal Lake, 3 mi away
Ranked #5 because of its Google rating and trade focus: 4.8★ from 1,043 Google reviews, listed on Google as “HVAC contractor”.
Based in Cary
Ranked #6 because of its Google rating and trade focus: 4.9★ from 338 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake, 4 mi away
Ranked #7 because of its Google rating and trade focus: 4.9★ from 571 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake, 4 mi away
Ranked #8 because of its Google rating and trade focus: 4.9★ from 472 Google reviews, listed on Google as “HVAC contractor”.
Based in Huntley, 7 mi away
Ranked #9 because of its Google rating and trade focus: 4.9★ from 820 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake, 4 mi away
Ranked #10 because of its Google rating and trade focus: 4.8★ from 744 Google reviews, listed on Google as “Furnace repair service”.
Based in Gilberts, 10 mi away
Ranked #11 because of its Google rating and trade focus: 4.8★ from 2,067 Google reviews, listed on Google as “HVAC contractor”.
Based in McHenry, 7 mi away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 596 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Hoffman Estates, 11 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 939 Google reviews, listed on Google as “HVAC contractor”.
Based in Rolling Meadows, 13 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 1,104 Google reviews, listed on Google as “HVAC contractor”.
Based in Elgin, 12 mi away
Ranked #15 because of its Google rating and trade focus: 5.0★ from 784 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake, 3 mi away
Ranked #16 because of its Google rating and trade focus: 4.9★ from 240 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake, 5 mi away
Ranked #17 because of its Google rating and trade focus: 4.8★ from 460 Google reviews, listed on Google as “HVAC contractor”.
Based in Elgin, 13 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 1,021 Google reviews, listed on Google as “HVAC contractor”.
Based in Island Lake, 5 mi away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 931 Google reviews, listed on Google as “HVAC contractor”.
Based in Algonquin, 4 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 148 Google reviews, listed on Google as “HVAC contractor”.
Based in Elgin, 13 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 776 Google reviews, listed on Google as “HVAC contractor”.
Based in Palatine, 12 mi away
Ranked #22 because of its Google rating and trade focus: 4.9★ from 1,082 Google reviews, listed on Google as “HVAC contractor”.
Based in Woodstock, 13 mi away
Ranked #23 because of its Google rating and trade focus: 4.9★ from 1,222 Google reviews, listed on Google as “HVAC contractor”.
Based in Lake Zurich, 9 mi away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 320 Google reviews, listed on Google as “HVAC contractor”.
Based in Palatine, 11 mi away
Ranked #25 because of its Google rating and trade focus: 4.9★ from 766 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 928 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 |
|---|---|---|
| A & J General | 5.0★ (2) | 5 mi |
| A Hartlett & Son | 4.5★ (2) | 13 mi |
| AM to PM Heating & Cooling | 5.0★ (2) | 13 mi |
| Andrej's Construction | 5.0★ (2) | 12 mi |
| Anthonys Heating & Air | 3.0★ (2) | 5 mi |
| Bill's Heating and Cooling Service | 5.0★ (2) | 3 mi |
| BP HEATING LLC | 5.0★ (2) | 13 mi |
| Conservative Heating & Air Conditioning | 3.0★ (2) | 7 mi |
| Countryview heating and cooling | 5.0★ (2) | 13 mi |
| Eagle Refrigeration Service | 4.5★ (2) | 13 mi |
| Excelsior | 5.0★ (2) | 11 mi |
| Extreme Heating & Air Conditioning | 5.0★ (1) | In Cary |
| Heating & Air Conditioning | 3.0★ (2) | 10 mi |
| Hoffman Commercial Heating and Cooling | 5.0★ (2) | 10 mi |
| Magic HVAC Inc | 5.0★ (2) | In Cary |
| Martin Enterprises Heating & Air Conditioning | 4.8★ (246) | 8 mi |
| Nick's Action Air | 5.0★ (2) | 6 mi |
| Precision Today Plumbing Heating Cooling Electrical (Miller's Area Heating) | 4.8★ (986) | 14 mi |
| TM HVAC contractor | 5.0★ (2) | 8 mi |
| Vita HVAC Services | 5.0★ (2) | 4 mi |
National price ranges in USD, not adjusted for Cary. 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 928 Cary 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 Cary 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 |