386 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Woodstock: Black Diamond Plumbing & Mechanical Inc., CR Score 94/100; 4.9★ from 6,580 Google reviews; open 24/7.
Best for emergencies (open 24/7): Woodstock Heating, Cooling & Electrical, posts 24/7 hours; ranked #2 of 386.
Most-reviewed: Lifeline Plumbing, Heating & Cooling, 3,222 Google reviews at 4.9★, the most of 386 ranked after Black Diamond Plumbing & Mechanical Inc.; ranked #5.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
386 Woodstock HVAC contractors are ranked here by CR Score, from 8 published factors. 193 are open 24/7, 290 open Saturdays and 238 open Sundays, based on posted hours. The median Google rating is 4.9★ across 386 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Black Diamond Plumbing & Mechanical Inc. | 94 | 4.9★ (6,580) | McHenry, 8 mi away | 24/7 | Overall |
| 2 | Woodstock Heating, Cooling & Electrical | 94 | 4.9★ (1,222) | Woodstock | 24/7 | Emergencies |
| 3 | GSHA Services, LTD | 93 | 4.9★ (747) | Woodstock | 24/7 | — |
| 4 | 24HR Home Comfort Services | 91 | 4.9★ (1,374) | Lake in the Hills, 12 mi away | 24/7 | — |
| 5 | Lifeline Plumbing, Heating & Cooling | 91 | 4.9★ (3,222) | Elgin, 18 mi away | 24/7 | Most reviews |
| 6 | McHenry Heating & Air, Inc. | 91 | 4.9★ (596) | McHenry, 8 mi away | 24/7 | — |
| 7 | Legacy Home Services | 90 | 4.9★ (571) | Crystal Lake, 9 mi away | 24/7 | — |
| 8 | Rellaire Smart Home Systems | 90 | 4.9★ (472) | Crystal Lake, 9 mi away | 24/7 | — |
| 9 | WeatherWise Heating & AC repair | 90 | 4.8★ (744) | Crystal Lake, 9 mi away | 24/7 | — |
| 10 | Althoff Home Services | 90 | 4.8★ (1,043) | Crystal Lake, 11 mi away | 24/7 | — |
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.
Ranked #1 because of its Google rating and review volume: 4.9★ from 6,580 Google reviews, the most Google reviews on this list (6,580).
Based in Woodstock
Ranked #2 because of its Google rating and availability: 4.9★ from 1,222 Google reviews, open 24/7.
Based in Woodstock
Ranked #3 because of its Google rating and availability: 4.9★ from 747 Google reviews, open 24/7.
Based in Lake in the Hills, 12 mi away
Ranked #4 because of its Google rating and availability: 4.9★ from 1,374 Google reviews, open 24/7.
Based in Elgin, 18 mi away
Ranked #5 because of its Google rating and availability: 4.9★ from 3,222 Google reviews, open 24/7.
Based in McHenry, 8 mi away
Ranked #6 because of its Google rating and availability: 4.9★ from 596 Google reviews, open 24/7.
Based in Crystal Lake, 9 mi away
Ranked #7 because of its Google rating and availability: 4.9★ from 571 Google reviews, open 24/7.
Based in Crystal Lake, 9 mi away
Ranked #8 because of its Google rating and availability: 4.9★ from 472 Google reviews, open 24/7.
Based in Crystal Lake, 9 mi away
Ranked #9 because of its Google rating and availability: 4.8★ from 744 Google reviews, open 24/7.
Based in Crystal Lake, 11 mi away
Ranked #10 because of its Google rating and availability: 4.8★ from 1,043 Google reviews, open 24/7.
Based in Gilberts, 15 mi away
Ranked #11 because of its Google rating and availability: 4.8★ from 2,067 Google reviews, open 24/7.
Based in Woodstock
Ranked #12 because of its Google rating and availability: 4.7★ from 185 Google reviews, open 24/7.
Based in Elgin, 18 mi away
Ranked #13 because of its Google rating and availability: 5.0★ from 776 Google reviews, open 24/7.
Based in Elgin, 18 mi away
Ranked #14 because of its Google rating and availability: 5.0★ from 784 Google reviews, open 24/7.
Based in Crystal Lake, 9 mi away
Ranked #15 because of its Google rating and availability: 4.8★ from 460 Google reviews, open 24/7.
Based in Elgin, 20 mi away
Ranked #16 because of its Google rating and availability: 5.0★ from 1,021 Google reviews, open 24/7.
Based in Crystal Lake, 7 mi away
Ranked #17 because of its Google rating and availability: 4.9★ from 147 Google reviews, open 24/7.
Based in Crystal Lake, 8 mi away
Ranked #18 because of its Google rating and availability: 4.8★ from 250 Google reviews, open 24/7.
Based in Huntley, 18 mi away
Ranked #19 because of its Google rating and availability: 4.9★ from 820 Google reviews, open 24/7.
Based in Cary, 14 mi away
Ranked #20 because of its Google rating and availability: 4.9★ from 338 Google reviews, open 24/7.
Based in Antioch, 21 mi away
Ranked #21 because of its Google rating and availability: 5.0★ from 745 Google reviews, open 24/7.
Based in Crystal Lake, 10 mi away
Ranked #22 because of its Google rating and availability: 5.0★ from 116 Google reviews, open 24/7.
Based in Round Lake, 18 mi away
Ranked #23 because of its Google rating and availability: 4.7★ from 2,290 Google reviews, open 24/7.
Based in Hoffman Estates, 23 mi away
Ranked #24 because of its Google rating and availability: 5.0★ from 939 Google reviews, open 24/7.
Based in Fox Lake, 15 mi away
Ranked #25 because of its Google rating and availability: 4.9★ from 371 Google reviews, open 24/7.
#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 386 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) | 10 mi |
| A Hartlett & Son | 4.5★ (2) | In Woodstock |
| Air Management Services Inc | 4.0★ (2) | 11 mi |
| Alex’s Duct Cleaning | 5.0★ (269) | 10 mi |
| Anthonys Heating & Air | 3.0★ (2) | 13 mi |
| Bill's Heating and Cooling Service | 5.0★ (2) | 13 mi |
| BP HEATING LLC | 5.0★ (2) | 13 mi |
| Comfort 24-7 - Woodstock | In Woodstock | |
| Conservative Heating & Air Conditioning | 3.0★ (2) | 14 mi |
| D & D Comfort Inc. Heating & Air Conditioning, Inc. | 4.9★ (110) | 11 mi |
| Dad And Son LLC | 5.0★ (2) | 19 mi |
| Eagle Refrigeration Service | 4.5★ (2) | 9 mi |
| Heating & Air Conditioning | 3.0★ (2) | 19 mi |
| Magic HVAC Inc | 5.0★ (2) | 12 mi |
| Nick's Action Air | 5.0★ (2) | 12 mi |
| One Call Heating & Cooling | 5.0★ (2) | 16 mi |
| Onyx Mechanical LLC | In Woodstock | |
| The Heating & Air Conditioning Co | 5.0★ (1) | In Woodstock |
| Tindall Heating & Cooling LLC | 5.0★ (1) | In Woodstock |
| Vita HVAC Services | 5.0★ (2) | 15 mi |
National price ranges in USD, not adjusted for Woodstock. 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 386 Woodstock 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.
| Factor | Weight | Computed from | In Woodstock data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |