150 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Alton: Millennium A/C, CR Score 66/100; 5.0★ from 1,058 Google reviews; open 24/7.
Best for emergencies (open 24/7): Atlas Electrical, Air Conditioning, Refrigeration & Plumbing Services, Inc., posts 24/7 hours; ranked #2 of 150.
Most-reviewed: Colair, 3,220 Google reviews at 5.0★, the most of 150 ranked; ranked #6.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
150 Alton HVAC contractors are ranked here by CR Score, from ten published factors. 47 are open 24/7, 115 open Saturdays and 71 open Sundays, based on posted hours. The median Google rating is 4.9★ across 150 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Millennium A/C | 66 | 5.0★ (1,058) | Mission, 6 mi away | 24/7 | Overall |
| 2 | Atlas Electrical, Air Conditioning, Refrigeration & Plumbing Services, Inc. | 65 | 4.8★ (594) | Alton | 24/7 | Emergencies |
| 3 | Prime Air HVAC & $149 Duct Cleaning | 65 | 5.0★ (866) | McAllen, 7 mi away | 24/7 | — |
| 4 | Frontier Cooling & Heating | 65 | 4.9★ (2,200) | Mission, 4 mi away | Sat · Sun · Evenings | — |
| 5 | Polar Air | Air Conditioning & Heating | 64 | 5.0★ (732) | Pharr, 9 mi away | 24/7 | — |
| 6 | Colair | 64 | 5.0★ (3,220) | Mission, 6 mi away | Sat · Evenings | Most reviews |
| 7 | Trevino Plumbing, Electrical & HVAC | 64 | 4.9★ (1,147) | Mission, 5 mi away | Sat · Sun · Evenings | — |
| 8 | EVERESST SERVICES TECH LLC | 64 | 4.9★ (344) | McAllen, 5 mi away | 24/7 | — |
| 9 | Cytech Heating & Cooling | 63 | 4.9★ (646) | Edinburg, 12 mi away | 24/7 | — |
| 10 | Global A/C & Heating LLC. | 62 | 4.7★ (187) | Mission, 2 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: 5.0★ from 1,058 Google reviews, listed on Google as “HVAC contractor”.
Ranked #2 because of its Google rating and trade focus: 4.8★ from 594 Google reviews, listed on Google as “HVAC contractor”.
Based in McAllen, 7 mi away
Ranked #3 because of its Google rating and trade focus: 5.0★ from 866 Google reviews, listed on Google as “HVAC contractor”.
Based in Mission, 4 mi away
Ranked #4 because of its Google rating and trade focus: 4.9★ from 2,200 Google reviews, listed on Google as “HVAC contractor”.
Based in Pharr, 9 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 732 Google reviews, listed on Google as “HVAC contractor”.
Based in Mission, 6 mi away
Ranked #6 because of its Google rating and review volume: 5.0★ from 3,220 Google reviews, the most in Alton.
Based in Mission, 5 mi away
Ranked #7 because of its Google rating and trade focus: 4.9★ from 1,147 Google reviews, listed on Google as “HVAC contractor”.
Based in McAllen, 5 mi away
Ranked #8 because of its Google rating and trade focus: 4.9★ from 344 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Edinburg, 12 mi away
Ranked #9 because of its Google rating and trade focus: 4.9★ from 646 Google reviews, listed on Google as “HVAC contractor”.
Based in Mission, 2 mi away
Ranked #10 because of its Google rating and trade focus: 4.7★ from 187 Google reviews, listed on Google as “HVAC contractor”.
Based in Pharr, 8 mi away
Ranked #11 because of its Google rating and review volume: 4.9★ from 2,689 Google reviews.
Based in McAllen, 9 mi away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 224 Google reviews, listed on Google as “HVAC contractor”.
Based in McAllen, 4 mi away
Ranked #13 because of its Google rating and trade focus: 4.9★ from 100 Google reviews, listed on Google as “HVAC contractor”.
Based in San Juan, 11 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 234 Google reviews, listed on Google as “HVAC contractor”.
Based in Mission, 5 mi away
Ranked #15 because of its Google rating and trade focus: 4.9★ from 103 Google reviews, listed on Google as “HVAC contractor”.
Based in McAllen, 7 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 91 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Edinburg, 9 mi away
Ranked #17 because of its Google rating and trade focus: 4.8★ from 202 Google reviews, listed on Google as “HVAC contractor”.
Based in Edinburg, 8 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 78 Google reviews, listed on Google as “HVAC contractor”.
Based in Mission, 6 mi away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 48 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Palmview South, 2 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “HVAC contractor”.
Based in McAllen, 7 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 113 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Alamo, 11 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 78 Google reviews, listed on Google as “HVAC contractor”.
Based in San Juan, 12 mi away
Ranked #23 because of its Google rating and trade focus: 4.9★ from 107 Google reviews, listed on Google as “HVAC contractor”.
Based in McAllen, 7 mi away
Ranked #24 because of its Google rating and trade focus: 4.9★ from 118 Google reviews, listed on Google as “HVAC contractor”.
Based in McAllen, 7 mi away
Ranked #25 because of its Google rating and trade focus: 4.7★ from 57 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 150 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 |
|---|---|---|
| Ace Electric Construction and plumbing 24 hour emergency service calls | 4.7★ (15) | 10 mi |
| Airbond Service | 4.2★ (5) | 3 mi |
| Aj's Heating & Cooling | 4.5★ (2) | 14 mi |
| Alanis Repair | 5.0★ (2) | 6 mi |
| Border Air Conditioning & Heating | 4.1★ (87) | 17 mi |
| CAM-AIR AC & HEATING | 3.0★ (2) | 22 mi |
| Checkmark Refrigeration LLC | 3.5★ (2) | 22 mi |
| ELECTRO-AC TRAINING CENTER | 5.0★ (1) | 5 mi |
| Farrell Plumbing & Cooling Inc. | 4.5★ (77) | 23 mi |
| Gomez HVAC Services | 5.0★ (2) | 6 mi |
| Hess Air Inc | 4.4★ (16) | 9 mi |
| Master Service llc , A/C Repair , Ice Machine Repair , Walk in Cooler And Freezer Repair | 4.4★ (7) | 14 mi |
| Pope Heating and Air of Weslaco | 5.0★ (2) | 22 mi |
| PRECISION AIR HEATING & COOLING, PLLC | 5.0★ (14) | 10 mi |
| ProTemp Air Conditioning | 5.0★ (8) | 21 mi |
| Reliable Kitchen Services | 4.4★ (7) | 21 mi |
| Rio Comfort Mechanical LLC | 5.0★ (2) | 14 mi |
| Steele HVAC Repair service LLC | 1.0★ (1) | 3 mi |
| Tri Temp Mechanical Service | 5.0★ (1) | 3 mi |
| Wolf on Roofs Construction | 5.0★ (2) | 7 mi |
National price ranges in USD, not adjusted for Alton. 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 Texas, Texas Department of Licensing and Regulation (TDLR) licenses Air conditioning and refrigeration contractor licenses (Class A and B).
No chip usually means we have not matched a state record yet. Check the lookup yourself before you hire.
Guide checked October 2026. How we verify licenses
In Texas, air conditioning calls peak in the hottest summer months. Spring is the easiest time to book a tune-up or replacement, before the first heat wave.
We scored 150 Alton 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 Alton 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 |