65/100CR 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 Derby, CT (2026)
505 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Derby: A & S Nathan Heating & Cooling LLC, CR Score 65/100; 4.8★ from 446 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Aire Serv of Shelton, posts 24/7 hours; ranked #2 of 505.
- 13
Most-reviewed: Sippin Energy Products, 2,594 Google reviews at 4.9★, the most of 505 ranked; ranked #13.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
505 Derby HVAC contractors are ranked here by CR Score, from ten published factors. 123 are open 24/7, 234 open Saturdays and 169 open Sundays, based on posted hours. The median Google rating is 4.8★ across 505 rated businesses.
Top 10 HVAC contractors in Derby at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | A & S Nathan Heating & Cooling LLC | 65 | 4.8★ (446) | Ansonia, 1 mi away | 24/7 | Overall |
| 2 | Aire Serv of Shelton | 64 | 4.8★ (347) | Ansonia, 1 mi away | 24/7 | Emergencies |
| 3 | HL Bowman Inc Plumbing Heating & AC | 64 | 4.7★ (1,151) | Milford, 7 mi away | 24/7 | — |
| 4 | Levco Oil & Propane | 63 | 4.7★ (590) | Trumbull, 6 mi away | 24/7 | — |
| 5 | Edgerton, Inc. | 63 | 4.8★ (555) | Bethel, 9 mi away | 24/7 | — |
| 6 | Celco Heating & Air Conditioning | 63 | 4.7★ (861) | Bridgeport, 10 mi away | 24/7 | — |
| 7 | Ward Heating and Cooling LLC | 62 | 5.0★ (240) | Bethel, 10 mi away | 24/7 | — |
| 8 | Air, Inc. | 62 | 4.8★ (692) | Branford, 14 mi away | 24/7 | — |
| 9 | Aire Serv of Southwest Connecticut | 62 | 4.8★ (565) | Ansonia, 14 mi away | 24/7 | — |
| 10 | American Heating Air Conditioning Service | 61 | 4.9★ (372) | Waterbury, 16 mi away | 24/7 | — |
The 505 best HVAC contractors in Derby, 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 Ansonia, 1 mi away
64/100CR ScoreRanked #2 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 Milford, 7 mi away
64/100CR ScoreRanked #3 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 Trumbull, 6 mi away
63/100CR ScoreRanked #4 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 Bethel, 9 mi away
63/100CR ScoreRanked #5 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 Bridgeport, 10 mi away
63/100CR ScoreRanked #6 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 Bethel, 10 mi away
62/100CR ScoreRanked #7 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
#8 Air, Inc.
Based in Branford, 14 mi away
62/100CR ScoreRanked #8 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 Ansonia, 14 mi away
62/100CR ScoreRanked #9 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, 16 mi away
61/100CR ScoreRanked #10 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, 24 mi away
61/100CR ScoreRanked #11 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
#12 Service Stars
Based in Danbury, 19 mi away
61/100CR ScoreRanked #12 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 Bethel, 9 mi away
61/100CR ScoreRanked #13 because of its Google rating and review volume: 4.9★ from 2,594 Google reviews, the most in Derby.
- 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 Wallingford, 18 mi away
61/100CR ScoreRanked #14 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
Based in Southbury, 11 mi away
61/100CR ScoreRanked #15 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 Shelton, 1 mi away
61/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 62 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 62 Google reviews
- Hours
- Mon–Sun 6 AM–10 PM
- Address
- 97 Bridgeport Ave, Shelton, CT 06484
Based in Bridgeport, 10 mi away
60/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 86 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 86 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 54 Glendale Ave, Bridgeport, CT 06606
Based in Bridgeport, 21 mi away
60/100CR ScoreRanked #18 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 Trumbull, 9 mi away
60/100CR ScoreRanked #19 because of its Google rating and review volume: 5.0★ from 570 Google reviews.
- 5.0★ from 570 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 90 Fresh Meadow Dr, Trumbull, CT 06611
Based in Danbury, 19 mi away
60/100CR ScoreRanked #20 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 Norwalk, 22 mi away
60/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.8★ from 1,998 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 1,998 Google reviews
- Hours
- Mon–Sun 7 AM–7 PM
- Address
- 70 Fort Point St, Norwalk, CT 06855
Based in Naugatuck, 11 mi away
60/100CR ScoreRanked #22 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 Danbury, 21 mi away
60/100CR ScoreRanked #23 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 Middlebury, 13 mi away
60/100CR ScoreRanked #24 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
Based in Milford, 7 mi away
60/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 39 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 39 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 301 Brewster Rd STE 17, Milford, CT 06460
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 505 ranked HVAC contractors here; the rest are on their profiles.
Also serving Derby
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) | 9 mi |
| Bridgeport HVAC | 3.0★ (2) | 10 mi |
| Climate Care, LLC | 4.6★ (171) | 21 mi |
| Comfort Zone Heating & Air Conditioning | 4.0★ (2) | 6 mi |
| Desirable Heating and Cooling | 4.0★ (2) | 2 mi |
| Direct Home Services | 4.7★ (268) | 22 mi |
| Jacozzi Plumbing Heating & Cooling | 5.0★ (2) | 6 mi |
| JDH Plumbing & Heating | 4.9★ (58) | 3 mi |
| M P Electric | 5.0★ (2) | 8 mi |
| Mobilio and Son HVAC | 4.7★ (112) | 18 mi |
| North East HVAC | 5.0★ (2) | 5 mi |
| Park City | 4.2★ (37) | 10 mi |
| POLO Plumbing & Heating LLC | 5.0★ (2) | 9 mi |
| RB MECHANICAL LLC | 5.0★ (16) | 10 mi |
| Renz Heating & Air Conditioning LLC | 5.0★ (2) | 8 mi |
| Royal Plumbing & Heating Co | 5.0★ (2) | 11 mi |
| SERVPRO of Shelton, Naugatuck | 5.0★ (37) | In Derby |
| SMR Heating And Cooling | 5.0★ (85) | 21 mi |
| SNS Electrical Services | 5.0★ (27) | In Derby |
| SolvIt Home Services | 4.5★ (42) | 11 mi |
How much do HVAC contractors cost in Derby?
National price ranges in USD, not adjusted for Derby. 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 Derby HVAC contractors
We scored 505 Derby 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 Derby 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 Derby: frequently asked questions
Who is the best HVAC contractor in Derby?
By CR Score, the highest-ranked HVAC contractor in Derby, CT is A & S Nathan Heating & Cooling LLC with a CR Score of 65/100. It has 4.8★ from 446 Google reviews. It is open 24/7. Aire Serv of Shelton (#2) and HL Bowman Inc Plumbing Heating & AC (#3) follow. We ranked 505 HVAC contractors on ten factors, last updated October 22, 2026.
How many HVAC contractors are there in Derby?
ContractorsRanked ranks 505 HVAC contractors serving Derby, CT. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
Which HVAC contractors in Derby are open 24/7?
123 ranked HVAC contractors in Derby post 24/7 hours. The highest-ranked are A & S Nathan Heating & Cooling LLC (#1), Aire Serv of Shelton (#2) and HL Bowman Inc Plumbing Heating & AC (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in Derby work on weekends?
234 of 505 ranked HVAC contractors post Saturday hours and 169 post Sunday hours. The highest-ranked open Saturdays are A & S Nathan Heating & Cooling LLC (#1), Aire Serv of Shelton (#2) and HL Bowman Inc Plumbing Heating & AC (#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 Derby?
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 Derby. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Derby HVAC contractors have?
The median Google rating among 505 rated HVAC contractors in Derby is 4.8★, with a median of 21 reviews. Sippin Energy Products has the most, 2,594 reviews, and ranks #13. 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 Derby?
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 Derby
- October 2026: CR Scores recalculated for 505 hvac contractors serving Derby.
- October 2026: 4 duplicate listings merged.
More HVAC contractors and Derby pages
HVAC contractors near Derby
- HVAC contractors in Shelton, CT506 ranked
- HVAC contractors in Ansonia, CT531 ranked
- HVAC contractors in Orange, CT504 ranked
- HVAC contractors in Woodbridge, CT522 ranked
- HVAC contractors in Seymour, CT553 ranked
- HVAC contractors in City of Milford (balance), CT522 ranked
- HVAC contractors in Milford, CT517 ranked
- HVAC contractors in Trumbull, CT501 ranked
- HVAC contractors in Oxford, CT549 ranked
- HVAC contractors in West Haven, CT441 ranked
Other trades in Derby
- Roofers in Derby1284 ranked
- Plumbers in Derby483 ranked
- Electricians in Derby398 ranked
- General contractors in Derby745 ranked
- Painters in Derby275 ranked
- Landscapers in Derby309 ranked
- Handymen in Derby92 ranked
- Kitchen remodelers in Derby431 ranked
- Bathroom remodelers in Derby403 ranked
- Flooring contractors in Derby308 ranked
- Tile installers in Derby68 ranked
- Drywall contractors in Derby23 ranked
- Concrete contractors in Derby151 ranked
- Fence contractors in Derby154 ranked
- Deck builders in Derby217 ranked
- Siding contractors in Derby620 ranked
- Window installers in Derby501 ranked
- Gutter installers in Derby244 ranked
- Insulation contractors in Derby65 ranked
- Solar installers in Derby148 ranked
- Garage door repair companies in Derby152 ranked
- Foundation repair companies in Derby169 ranked
- Tree services in Derby420 ranked
- Masonry contractors in Derby415 ranked
- Water damage restoration companies in Derby606 ranked
- Home builders in Derby456 ranked
- Demolition contractors in Derby62 ranked
- All contractors in Derby