196 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in DeKalb: Service Now Home Services, CR Score 66/100; 4.9★ from 879 Google reviews; open 24/7.
Best for emergencies (open 24/7): Comfort Ness Heating & Cooling, posts 24/7 hours; ranked #2 of 196.
Most-reviewed: Mendel Plumbing, Heating & Electric, 2,793 Google reviews at 4.9★, the most of 196 ranked; ranked #44.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
196 DeKalb HVAC contractors are ranked here by CR Score, from ten published factors. 96 are open 24/7, 130 open Saturdays and 106 open Sundays, based on posted hours. The median Google rating is 4.9★ across 196 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Service Now Home Services | 66 | 4.9★ (879) | DeKalb | 24/7 | Overall |
| 2 | Comfort Ness Heating & Cooling | 64 | 5.0★ (127) | DeKalb | 24/7 | Emergencies |
| 3 | Joiner's HVAC, Inc. | 64 | 5.0★ (129) | DeKalb | 24/7 | — |
| 4 | Hero Heating & Air Conditioning | 64 | 4.8★ (209) | DeKalb | 24/7 | — |
| 5 | Smith-Dahlquist, Inc. | 63 | 4.9★ (194) | Sycamore, 5 mi away | 24/7 | — |
| 6 | McNally's Heating and Cooling | 62 | 4.9★ (2,593) | Batavia, 24 mi away | 24/7 | — |
| 7 | All-Star Heating & Air Conditioning Inc. | 62 | 4.5★ (138) | DeKalb | 24/7 | — |
| 8 | Kustom Heating and Cooling | 62 | 5.0★ (1,021) | Elgin, 23 mi away | 24/7 | — |
| 9 | Cady Heating and Cooling | 62 | 4.8★ (128) | Sycamore, 5 mi away | 24/7 | — |
| 10 | Climate Control Services LLC | 61 | 5.0★ (776) | Elgin, 21 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 879 Google reviews, listed on Google as “Heating contractor”.
Based in DeKalb
Ranked #2 because of its Google rating and trade focus: 5.0★ from 127 Google reviews, listed on Google as “HVAC contractor”.
Based in DeKalb
Ranked #3 because of its Google rating and trade focus: 5.0★ from 129 Google reviews, listed on Google as “HVAC contractor”.
Based in DeKalb
Ranked #4 because of its Google rating and trade focus: 4.8★ from 209 Google reviews, listed on Google as “HVAC contractor”.
Based in Sycamore, 5 mi away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 194 Google reviews, listed on Google as “HVAC contractor”.
Based in Batavia, 24 mi away
Ranked #6 because of its Google rating and trade focus: 4.9★ from 2,593 Google reviews, listed on Google as “HVAC contractor”.
Based in DeKalb
Ranked #7 because of its Google rating and trade focus: 4.5★ from 138 Google reviews, listed on Google as “HVAC contractor”.
Based in Elgin, 23 mi away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 1,021 Google reviews, listed on Google as “HVAC contractor”.
Based in Sycamore, 5 mi away
Ranked #9 because of its Google rating and trade focus: 4.8★ from 128 Google reviews, listed on Google as “HVAC contractor”.
Based in Elgin, 21 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 776 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Charles, 25 mi away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 1,873 Google reviews, listed on Google as “HVAC contractor”.
Based in Gilberts, 23 mi away
Ranked #12 because of its Google rating and trade focus: 4.8★ from 2,067 Google reviews, listed on Google as “HVAC contractor”.
Based in Aurora, 25 mi away
Ranked #13 because of its Google rating and trade focus: 4.9★ from 1,637 Google reviews, listed on Google as “HVAC contractor”.
Based in Elgin, 23 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 784 Google reviews, listed on Google as “HVAC contractor”.
Based in DeKalb
Ranked #15 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “HVAC contractor”.
Based in Geneva, 24 mi away
Ranked #16 because of its Google rating and trade focus: 4.8★ from 1,224 Google reviews, listed on Google as “HVAC contractor”.
Based in Rockford, 18 mi away
Ranked #17 because of its Google rating and trade focus: 4.8★ from 463 Google reviews, listed on Google as “HVAC contractor”.
Based in Sycamore, 5 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 38 Google reviews, listed on Google as “HVAC contractor”.
Based in Hampshire, 16 mi away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 153 Google reviews, listed on Google as “HVAC contractor”.
Based in Sandwich, 21 mi away
Ranked #20 because of its Google rating and trade focus: 4.9★ from 1,048 Google reviews, listed on Google as “HVAC contractor”.
Based in Elburn, 14 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 103 Google reviews, listed on Google as “HVAC contractor”.
Based in Montgomery, 25 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 434 Google reviews, listed on Google as “Furnace repair service”.
Based in Aurora, 23 mi away
Ranked #23 because of its Google rating and trade focus: 4.9★ from 440 Google reviews, listed on Google as “HVAC contractor”.
Based in Rochelle, 16 mi away
Ranked #24 because of its Google rating and trade focus: 4.9★ from 154 Google reviews, listed on Google as “HVAC contractor”.
Based in Saint Charles, 21 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 226 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 196 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 |
|---|---|---|
| 1 Source Mechanical | 5.0★ (1) | In DeKalb |
| Alfixit HVAC LLC | In DeKalb | |
| Alfixit HVAC Services | In DeKalb | |
| All In 01 Services | 5.0★ (2) | 23 mi |
| AM to PM Heating & Cooling | 5.0★ (2) | 24 mi |
| Black Widow Heating & Cooling LLC | 5.0★ (91) | 24 mi |
| Complete Plumbing Services, Inc. | 4.8★ (21) | 12 mi |
| D & D Comfort Inc. Heating & Air Conditioning, Inc. | 4.9★ (110) | 23 mi |
| Improved Comfort Heating & Air Conditioning | 5.0★ (60) | 21 mi |
| Irving Construction Co., Inc. | In DeKalb | |
| LE Heating And Cooling | 5.0★ (2) | 21 mi |
| Newton's HVAC | 5.0★ (2) | 9 mi |
| One Call Heating & Cooling | 5.0★ (2) | 16 mi |
| Ron's Heating & Air Conditioning - 24 h/r emergency service | 4.6★ (47) | 5 mi |
| Service Concepts Inc - Commercial Heating and Cooling - Genoa, IL | 3.0★ (2) | 12 mi |
| Team Trusted Heating & Cooling | In DeKalb | |
| The Furnace guy llc | In DeKalb | |
| Turbaire one of Sandwich | 5.0★ (2) | 22 mi |
| Votaw Plumbing, L.L.C. | 4.9★ (50) | In DeKalb |
| ZN Heating and Cooling, Inc | 5.0★ (2) | 15 mi |
National price ranges in USD, not adjusted for DeKalb. 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 196 DeKalb 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 DeKalb 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 |