695 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Crystal Lake: 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 695.
Most-reviewed: ABC Plumbing, Sewer, Heating, Cooling & Electric, 22,524 Google reviews at 4.7★, the most of 695 ranked; ranked #12.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
695 Crystal Lake HVAC contractors are ranked here by CR Score, from ten published factors. 332 are open 24/7, 533 open Saturdays and 431 open Sundays, based on posted hours. The median Google rating is 4.9★ across 695 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, 5 mi away | 24/7 | Overall |
| 2 | 24HR Home Comfort Services | 64 | 4.9★ (1,374) | Lake in the Hills, 4 mi away | 24/7 | Emergencies |
| 3 | Althoff Home Services | 64 | 4.8★ (1,043) | Crystal Lake | 24/7 | — |
| 4 | Legacy Home Services | 64 | 4.9★ (571) | Crystal Lake | 24/7 | — |
| 5 | Rellaire Smart Home Systems | 63 | 4.9★ (472) | Crystal Lake | 24/7 | — |
| 6 | WeatherWise Heating & AC repair | 63 | 4.8★ (744) | Crystal Lake | 24/7 | — |
| 7 | Lifeline Plumbing, Heating & Cooling | 63 | 4.9★ (3,222) | Elgin, 10 mi away | 24/7 | — |
| 8 | Four Seasons Heating, Air Conditioning, Plumbing, & Electric | 63 | 4.8★ (460) | Crystal Lake | 24/7 | — |
| 9 | McHenry Heating & Air, Inc. | 62 | 4.9★ (596) | McHenry, 5 mi away | 24/7 | — |
| 10 | Northern Comfort Heating Air Conditioning Duct Cleaning,Inc | 62 | 4.9★ (240) | Crystal Lake | 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, 4 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 Crystal Lake
Ranked #3 because of its Google rating and trade focus: 4.8★ from 1,043 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake
Ranked #4 because of its Google rating and trade focus: 4.9★ from 571 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake
Ranked #5 because of its Google rating and trade focus: 4.9★ from 472 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake
Ranked #6 because of its Google rating and trade focus: 4.8★ from 744 Google reviews, listed on Google as “Furnace repair service”.
Based in Elgin, 10 mi away
Ranked #7 because of its Google rating and trade focus: 4.9★ from 3,222 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake
Ranked #8 because of its Google rating and trade focus: 4.8★ from 460 Google reviews, listed on Google as “HVAC contractor”.
Based in McHenry, 5 mi away
Ranked #9 because of its Google rating and trade focus: 4.9★ from 596 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Crystal Lake
Ranked #10 because of its Google rating and trade focus: 4.9★ from 240 Google reviews, listed on Google as “HVAC contractor”.
Based in Woodstock, 8 mi away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 1,222 Google reviews, listed on Google as “HVAC contractor”.
Based in Arlington Heights, 18 mi away
Ranked #12 because of its Google rating and review volume: 4.7★ from 22,524 Google reviews, the most in Crystal Lake.
Based in Woodstock, 7 mi away
Ranked #13 because of its Google rating and trade focus: 4.9★ from 747 Google reviews, listed on Google as “HVAC contractor”.
Based in Gilberts, 10 mi away
Ranked #14 because of its Google rating and trade focus: 4.8★ from 2,067 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake
Ranked #15 because of its Google rating and trade focus: 4.8★ from 250 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake
Ranked #16 because of its Google rating and trade focus: 5.0★ from 116 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake
Ranked #17 because of its Google rating and trade focus: 4.9★ from 147 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake
Ranked #18 because of its Google rating and trade focus: 5.0★ from 101 Google reviews, listed on Google as “HVAC contractor”.
Based in Cary, 5 mi away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 338 Google reviews, listed on Google as “HVAC contractor”.
Based in Huntley, 10 mi away
Ranked #20 because of its Google rating and trade focus: 4.9★ from 820 Google reviews, listed on Google as “HVAC contractor”.
Based in Elgin, 12 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 784 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake
Ranked #22 because of its Google rating and trade focus: 4.9★ from 102 Google reviews, listed on Google as “HVAC contractor”.
Based in Elgin, 13 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 776 Google reviews, listed on Google as “HVAC contractor”.
Based in Elgin, 14 mi away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 1,021 Google reviews, listed on Google as “HVAC contractor”.
Based in Crystal Lake
Ranked #25 because of its Google rating and trade focus: 4.8★ from 125 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 695 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) | 3 mi |
| A Hartlett & Son | 4.5★ (2) | 8 mi |
| Algonquin Heating & Air Conditioning | 4.7★ (143) | 5 mi |
| All Bright Electric Inc | 4.1★ (26) | In Crystal Lake |
| Anthonys Heating & Air | 3.0★ (2) | 6 mi |
| Bill's Heating and Cooling Service | 5.0★ (2) | 5 mi |
| Building Energy Experts | 4.7★ (61) | In Crystal Lake |
| Comfort 24-7 - Crystal Lake | In Crystal Lake | |
| Conservative Heating & Air Conditioning | 3.0★ (2) | 7 mi |
| Magic HVAC Inc | 5.0★ (2) | 4 mi |
| MetroStar Inc | 5.0★ (1) | In Crystal Lake |
| Morozko Heating & Air Conditioning LLC | 1.0★ (1) | In Crystal Lake |
| Nick's Action Air | 5.0★ (2) | In Crystal Lake |
| Paragon Insulation & Services | 4.6★ (54) | In Crystal Lake |
| Precision Today Plumbing Heating Cooling Electrical (Miller's Area Heating) | 4.8★ (986) | 16 mi |
| Rivas Masonry and Restoration, Inc. | 5.0★ (1) | In Crystal Lake |
| TopTec Heating, Cooling, Plumbing & Electrical | 4.8★ (2,018) | 19 mi |
| Trademark Mechanical Inc | In Crystal Lake | |
| Vita HVAC Services | 5.0★ (2) | In Crystal Lake |
| Vortex Heating & Air | In Crystal Lake |
National price ranges in USD, not adjusted for Crystal Lake. 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 695 Crystal Lake 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 Crystal Lake 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 |