64/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.8★ from 446 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 446 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 34 Clifton Ave, Ansonia, CT 06401
Best HVAC Contractors in Seymour, CT (2026)
553 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Seymour: A & S Nathan Heating & Cooling LLC, CR Score 64/100; 4.8★ from 446 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Ward Heating and Cooling LLC, posts 24/7 hours; ranked #2 of 553.
- 14
Most-reviewed: Total Mechanical Systems, 2,607 Google reviews at 4.7★, the most of 553 ranked; ranked #14.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
553 Seymour HVAC contractors are ranked here by CR Score, from ten published factors. 134 are open 24/7, 259 open Saturdays and 186 open Sundays, based on posted hours. The median Google rating is 4.8★ across 553 rated businesses.
Top 10 HVAC contractors in Seymour at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | A & S Nathan Heating & Cooling LLC | 64 | 4.8★ (446) | Ansonia, 4 mi away | 24/7 | Overall |
| 2 | Ward Heating and Cooling LLC | 63 | 5.0★ (240) | Bethel, 6 mi away | 24/7 | Emergencies |
| 3 | Aire Serv of Shelton | 63 | 4.8★ (347) | Ansonia, 4 mi away | 24/7 | — |
| 4 | Edgerton, Inc. | 63 | 4.8★ (555) | Bethel, 10 mi away | 24/7 | — |
| 5 | HL Bowman Inc Plumbing Heating & AC | 63 | 4.7★ (1,151) | Milford, 13 mi away | 24/7 | — |
| 6 | American Heating Air Conditioning Service | 62 | 4.9★ (372) | Waterbury, 10 mi away | 24/7 | — |
| 7 | Ryan F. Murphy Heating & Cooling LLC | 62 | 5.0★ (969) | New Milford, 21 mi away | 24/7 | — |
| 8 | Levco Oil & Propane | 62 | 4.7★ (590) | Trumbull, 11 mi away | 24/7 | — |
| 9 | Aiello Home Services- Plumbing, Heating, AC, Electrical & Drain Cleaning | 62 | 4.8★ (601) | Wallingford, 15 mi away | 24/7 | — |
| 10 | Air, Inc. | 62 | 4.8★ (692) | Branford, 16 mi away | 24/7 | — |
The 553 best HVAC contractors in Seymour, ranked
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.
Based in Bethel, 6 mi away
63/100CR ScoreRanked #2 because of its Google rating and trade focus: 5.0★ from 240 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 240 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Ansonia, 4 mi away
63/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.8★ from 347 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 347 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 41 Clifton Ave, Ansonia, CT 06401
Based in Bethel, 10 mi away
63/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.8★ from 555 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 555 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 786 Main St, Monroe, CT 06468
Based in Milford, 13 mi away
63/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.7★ from 1,151 Google reviews, listed on Google as “HVAC contractor”.
- 4.7★ from 1,151 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 922 Bridgeport Ave, Milford, CT 06460
Based in Waterbury, 10 mi away
62/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.9★ from 372 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 372 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 64 Westridge Dr, Waterbury, CT 06708
Based in New Milford, 21 mi away
62/100CR ScoreRanked #7 because of its Google rating and trade focus: 5.0★ from 969 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 969 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 8 S Main St, New Milford, CT 06776
Based in Trumbull, 11 mi away
62/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.7★ from 590 Google reviews, listed on Google as “HVAC contractor”.
- 4.7★ from 590 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 55 Merritt Blvd, Trumbull, CT 06611
Based in Wallingford, 15 mi away
62/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.8★ from 601 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 601 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 21 N Plains Industrial Rd unit C, Wallingford, CT 06492
#10 Air, Inc.
Based in Branford, 16 mi away
62/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.8★ from 692 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 692 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 171 Short Beach Rd, Branford, CT 06405
Based in Southbury, 7 mi away
61/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.8★ from 170 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 170 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1257 Southford Rd, Southbury, CT 06488
Based in Bridgeport, 15 mi away
61/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.7★ from 861 Google reviews, listed on Google as “HVAC contractor”.
- 4.7★ from 861 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 467 Bishop Ave, Bridgeport, CT 06610
Based in Naugatuck, 5 mi away
61/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.9★ from 90 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 90 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 485 Cherry St, Naugatuck, CT 06770
Based in Plainville, 23 mi away
61/100CR ScoreRanked #14 because of its Google rating and review volume: 4.7★ from 2,607 Google reviews, the most in Seymour.
- 4.7★ from 2,607 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 74 Northwest Dr, Plainville, CT 06062
Based in Middlebury, 8 mi away
61/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.9★ from 115 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 115 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
#16 Service Stars
Based in Danbury, 18 mi away
61/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.9★ from 1,350 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 1,350 Google reviews
- Hours
- Mon–Sun 7:30 AM–10 PM
- Address
- 43C Beaver Brook Rd, Danbury, CT 06810
Based in Bristol, 19 mi away
61/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.8★ from 695 Google reviews, listed on Google as “Heating contractor”.
- 4.8★ from 695 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 175 Spring St, Southington, CT 06489
Based in Ansonia, 18 mi away
61/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.8★ from 565 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 565 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Waterbury, 10 mi away
60/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.9★ from 277 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 277 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 240 Railroad Hill St, Waterbury, CT 06708
Based in Bethel, 11 mi away
60/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.9★ from 2,594 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 2,594 Google reviews
- Hours
- Mon–Fri 7 AM–4:30 PM · Sat–Sun closed
- Address
- 234 Main St, Monroe, CT 06468
Based in Danbury, 18 mi away
60/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.9★ from 2,252 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 2,252 Google reviews
- Hours
- Mon–Fri 7 AM–6 PM · Sat 8 AM–12 PM · Sun closed
- Address
- 92 Sand Pit Rd, Danbury, CT 06810
Based in Naugatuck, 6 mi away
60/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 44 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 44 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 19 Tower Ln, Naugatuck, CT 06770
Based in Bridgeport, 23 mi away
60/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.9★ from 529 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 529 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Danbury, 20 mi away
60/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.9★ from 380 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 380 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 37A Padanaram Rd, Danbury, CT 06811
Based in Seymour
60/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 15 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 15 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 619 S Main St, Seymour, CT 06483
HVAC contractors ranked #26 to #50
#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 553 ranked HVAC contractors here; the rest are on their profiles.
Also serving Seymour
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 |
|---|---|---|
| Active Air LLC | 5.0★ (44) | 13 mi |
| Added Comfort Llc | In Seymour | |
| Arctic Air Inc | In Seymour | |
| Comfort Zone Heating & Air Conditioning | 4.0★ (2) | 9 mi |
| Desirable Heating and Cooling | 4.0★ (2) | 7 mi |
| Devine Design Contractors PLLC | 5.0★ (2) | 10 mi |
| Direct Home Services | 4.7★ (268) | 19 mi |
| Jacozzi Plumbing Heating & Cooling | 5.0★ (2) | 9 mi |
| John Anroman Plumbing & Heating | In Seymour | |
| LeClaire Heating & Air Conditioning LLC | 3.1★ (22) | In Seymour |
| Mirabito Energy Products | In Seymour | |
| Muphy Bros. HVAC | In Seymour | |
| North East HVAC | 5.0★ (2) | 10 mi |
| North Haven Mechanical Contractors | 5.0★ (2) | 11 mi |
| NorthEast Heating & Cooling | 5.0★ (12) | 5 mi |
| POLO Plumbing & Heating LLC | 5.0★ (2) | 8 mi |
| Saucier Mechanical Services | 4.7★ (70) | 15 mi |
| SMR Heating And Cooling | 5.0★ (85) | 18 mi |
| Sollas Heating | 4.7★ (33) | 11 mi |
| Tyler Heating, Air Conditioning, Refrigeration LLC | 4.7★ (570) | 16 mi |
How much do HVAC contractors cost in Seymour?
National price ranges in USD, not adjusted for Seymour. 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 |
How to check an HVAC contractor's license in Connecticut
In Connecticut, Connecticut Department of Consumer Protection licenses Heating, piping, cooling and sheet metal licenses.
- Search the business name or license number on the Connecticut Department of Consumer Protection license lookup.
- Check that the status is active and the name matches the contract or truck.
- Ask for proof of insurance before work starts.
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
When to hire an HVAC contractor in Connecticut
In Connecticut, 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.
How we ranked Seymour HVAC contractors
We scored 553 Seymour 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 Seymour 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 |
HVAC contractors in Seymour: frequently asked questions
Who is the best HVAC contractor in Seymour?
By CR Score, the highest-ranked HVAC contractor in Seymour, CT is A & S Nathan Heating & Cooling LLC with a CR Score of 64/100. It has 4.8★ from 446 Google reviews. It is open 24/7. Ward Heating and Cooling LLC (#2) and Aire Serv of Shelton (#3) follow. We ranked 553 HVAC contractors on ten factors, last updated October 22, 2026.
How many HVAC contractors are there in Seymour?
ContractorsRanked ranks 553 HVAC contractors serving Seymour, CT. 1 of them is based in Seymour; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
Which HVAC contractors in Seymour are open 24/7?
134 ranked HVAC contractors in Seymour post 24/7 hours. The highest-ranked are A & S Nathan Heating & Cooling LLC (#1), Ward Heating and Cooling LLC (#2) and Aire Serv of Shelton (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in Seymour work on weekends?
259 of 553 ranked HVAC contractors post Saturday hours and 186 post Sunday hours. The highest-ranked open Saturdays are A & S Nathan Heating & Cooling LLC (#1), Ward Heating and Cooling LLC (#2) and Aire Serv of Shelton (#3). Posted hours are office hours; crews may book weekend jobs separately.
How do I check an HVAC contractor's license in Connecticut?
In Connecticut, Connecticut Department of Consumer Protection handles licensing and covers Heating, piping, cooling and sheet metal licenses. Search the business or license number at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx.
How much does ac replacement cost in Seymour?
AC replacement typically costs $3,887 to $8,073, with $5,978 typical (Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range). This is a national range, not adjusted for Seymour. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Seymour HVAC contractors have?
The median Google rating among 553 rated HVAC contractors in Seymour is 4.8★, with a median of 22 reviews. Total Mechanical Systems has the most, 2,607 reviews, and ranks #14. We adjust ratings for review count, so a few five-star reviews cannot top the list.
When is the best time to hire an HVAC contractor in Seymour?
In Connecticut, 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.
Update log for Seymour
- October 2026: CR Scores recalculated for 553 hvac contractors serving Seymour.
- October 2026: 4 duplicate listings merged.
More HVAC contractors and Seymour pages
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