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Emergency HVAC Contractors in Crystal Lake, IL (2026)

Top 50 of 695 HVAC contractors, in emergency orderUpdated 0 paid placements in this rankingHow we rank

25 of the 50 HVAC contractors on this list post 24/7 hours. 24/7 businesses come first, then same-day, each ranked by CR Score with availability weighted higher.

If you smell gas, leave the building now and call your gas utility or 911 from outside.

The short answer

  1. 1

    #1 for emergency heating and cooling in Crystal Lake: Black Diamond Plumbing & Mechanical Inc., open 24/7.

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

Top emergency HVAC contractors in Crystal Lake at a glance

Top emergency HVAC contractors in Crystal Lake at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Black Diamond Plumbing & Mechanical Inc.664.9★ (6,580)McHenry, 5 mi away24/7
2Althoff Home Services644.8★ (1,043)Crystal Lake24/7
324HR Home Comfort Services644.9★ (1,374)Lake in the Hills, 4 mi away24/7
4Legacy Home Services644.9★ (571)Crystal Lake24/7
5WeatherWise Heating & AC repair644.8★ (744)Crystal Lake24/7
6Rellaire Smart Home Systems644.9★ (472)Crystal Lake24/7
7Lifeline Plumbing, Heating & Cooling634.9★ (3,222)Elgin, 10 mi away24/7
8Four Seasons Heating, Air Conditioning, Plumbing, & Electric634.8★ (460)Crystal Lake24/7
9ABC Plumbing, Sewer, Heating, Cooling & Electric634.7★ (22,524)Arlington Heights, 18 mi away24/7
10Alex’s Duct Cleaning635.0★ (269)Fox Lake, 2 mi away24/7

Call an emergency HVAC contractor in Crystal Lake now

24/7 hours mean the business says its phone is answered around the clock. Arrival time depends on where the crew is. Ask for an arrival window when you call.

The 50 emergency HVAC contractors in Crystal Lake, ranked

24/7 first, then same-day service, then the rest. Each group is in CR Score order on emergency weights. The full ranking of all 695 is on the HVAC contractors page.

Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  2. #2 Althoff Home Services

    Based in Crystal Lake

    64/100CR Score

    Ranked #2 because of its Google rating and trade focus: 4.8★ from 1,043 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 1,043 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    8001 S Illinois Rte 31, Crystal Lake, IL 60014
    View profile for Althoff Home Services(815) 455-7000

  4. #4 Legacy Home Services

    Based in Crystal Lake

    64/100CR Score

    Ranked #4 because of its Google rating and trade focus: 4.9★ from 571 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 571 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    7316 Teckler Blvd Ste 2B, Crystal Lake, IL 60014
    View profile for Legacy Home Services(815) 938-0137

  14. #14 G & R Heating and Air

    Based in Gilberts, 10 mi away

    63/100CR Score

    Ranked #14 because of its Google rating and trade focus: 4.8★ from 2,067 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 2,067 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    24 Center Dr Unit #9, Gilberts, IL 60136
    View profile for G & R Heating and Air(224) 850-3187

  15. #15 Absolute Comfort

    Based in Crystal Lake

    62/100CR Score

    Ranked #15 because of its Google rating and trade focus: 4.8★ from 250 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 250 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    60 W Terra Cotta Ave, Crystal Lake, IL 60014
    View profile for Absolute Comfort(815) 893-9276

  16. #16 GSHA Services, LTD

    Based in Woodstock, 7 mi away

    62/100CR Score

    Ranked #16 because of its Google rating and trade focus: 4.9★ from 747 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 747 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1257 Cobblestone Way Unit A, Woodstock, IL 60098
    View profile for GSHA Services, LTD(224) 220-3660

Top 50 of 695 HVAC contractors by emergency score

#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile.

HVAC contractors in Crystal Lake, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Duane Blanton Plumbing, Sewer, Heating & Cooling614.7★ (2,290)14 mi
27Kustom Heating and Cooling615.0★ (1,021)14 mi
28Air Blue Heating and Cooling615.0★ (148)5 mi
29Evolution Mechanical Heating & Cooling615.0★ (57)In Crystal Lake
30On The Mark Heating and Air615.0★ (939)15 mi
31Wally's Heating & AC614.9★ (95)2 mi
32Amy Home Services614.8★ (483)9 mi
33JV heating & cooling LLC614.8★ (69)In Crystal Lake
34Gleason Plumbing, Heating and Air614.8★ (420)9 mi
35Woodstock Heating and Cooling, LLC615.0★ (45)In Crystal Lake
36Combined Services HVAC614.8★ (175)5 mi
37Compass Heating and Air Conditioning Inc.614.9★ (412)11 mi
38American Star Total Home Comfort615.0★ (1,104)18 mi
39Birdie Heating & Cooling615.0★ (121)6 mi
40Five Star Heating & Air, Inc.614.9★ (1,082)16 mi
41Four Seasons Heating, Air Conditioning, Plumbing, & Electric614.8★ (506)11 mi
42Four Seasons Heating, Air Conditioning, Plumbing, Electric614.7★ (2,787)18 mi
43Aire Serv of Palatine604.9★ (766)16 mi
44Precision Today Plumbing Heating Cooling Electrical (Miller's Area Heating)604.8★ (986)16 mi
45TopTec Heating, Cooling, Plumbing & Electrical604.8★ (2,018)19 mi
46Family Man Heating and Cooling605.0★ (530)15 mi
47Aaron & Trecker Heating and Air Conditioning605.0★ (320)13 mi
48Premier Comfort Heating & Cooling LLC604.9★ (371)12 mi
49Silver Star Heating & Cooling605.0★ (30)In Crystal Lake
50Algonquin Heating & Air Conditioning604.7★ (143)5 mi

How we ranked emergency HVAC contractors in Crystal Lake

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

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 from
Reputation15%Google star rating, adjusted for how many reviews back it
Credentials15%Active state license, bond and workers’ comp on file
Review volume10%Number of Google reviews, compared with the most-reviewed business on the list
Recency5%Share of reviews from the last 12 months
Availability15%Weekly open hours, Saturday, Sunday, 24/7 or same-day
Trade focus10%How clearly the business does this trade (its Google category and name)
Proximity5%Based in the city scores highest, less the farther away it is
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodically
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there are

Emergency HVAC contractors in Crystal Lake: questions

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

25 on this list post 24/7 hours, including Black Diamond Plumbing & Mechanical Inc., Althoff Home Services, 24HR Home Comfort Services, Legacy Home Services and WeatherWise Heating & AC repair.

Who is ranked #1 for emergency heating and cooling in Crystal Lake, IL?

Black Diamond Plumbing & Mechanical Inc. is #1, with a CR Score of 66 out of 100 on emergency weights.

How are emergency HVAC contractors in Crystal Lake ranked?

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

What should I do before the HVAC contractor arrives?

If you smell gas, leave the building now and call your gas utility or 911 from outside.

How many emergency HVAC contractors here list a phone number?

25 of the 25 businesses ranked in full list a phone number. Tap Call to dial it.

Update log for Crystal Lake

  1. October 2026: CR Scores recalculated for 695 hvac contractors serving Crystal Lake.
  2. October 2026: 4 duplicate listings merged.

More emergency and heating and cooling pages