Top 7 HVAC companies in New Haven, Connecticut

New Haven County lists seven HVAC contractors drawn from public directories. Their placement rests on a Bayesian-adjusted rating that pulls every raw score toward the national mean of 4.764. Firms with few reviews receive the strongest pull; those with more reviews move closer to their raw number. A public website and published 24/7 availability serve as minor tie-breakers. The result is a shortlist, not an endorsement of workmanship.

The shortlist

Green Duct

Green Duct operates from 17 James St, New Haven, CT 06513 and lists (475) 242-4072. Its Services category and public website supply the tie-breaker that placed it first. Three reviews produced a raw 5.0 that the model pulled down to an adjusted score of 4.825. The 0.061 gap reflects the modest review count. These figures cannot reveal whether the firm maintains the same performance on larger jobs.

Heating and Cooling

Heating and Cooling lists 3 Wilson St, East Haven, CT 06512 and (203) 280-1281. Its General contractor category and published 24/7 availability supplied the tie-breaker for second place. Six reviews at a raw 5.0 adjusted to 4.823. The 0.059 difference shows the model still exerting modest downward pressure. The numbers give no information on parts inventory or typical response times outside advertised hours.

Daikin Comfort Technologies Northeast

Daikin Comfort Technologies Northeast sits at 50 Ives Pl Building A, New Haven, CT 06511 and can be reached at (203) 208-3220. Its public website earned the tie-breaker. One review at raw 5.0 adjusted to 4.812. The 0.048 gap illustrates the stronger pull applied to single-review firms. The data do not indicate how often the firm actually installs Daikin equipment versus other brands.

Gold AC & Heating Services

Gold AC & Heating Services lists 114 Boston Post Rd #230, West Haven, CT 06516 and (203) 344-7549. Its General contractor category and public website provided the tie-breaker. One review at raw 5.0 adjusted to 4.812. The 0.048 difference again reflects the limited review volume. Nothing in the listing shows whether the firm carries its own service trucks or subcontracts labor.

Tomax Heating & Cooling

Tomax Heating & Cooling is located at 800 N Lakeview Dr, Orange, CT 06477 and lists (203) 752-8430. Seven reviews produced a raw 5.0 that adjusted to 4.809 with no additional tie-breakers. The 0.045 gap is the smallest among the top five. The figures cannot disclose typical lead times during the winter peak.

New Haven Heating & Cooling Services

New Haven Heating & Cooling Services operates from 688 Ella T Grasso Blvd, New Haven, CT 06519 and lists (475) 234-2974. Five reviews at raw 5.0 adjusted to 4.798. The 0.034 gap shows the model still moving the score downward. The listing supplies no detail on fuel-oil conversion experience.

New haven Air Duct Cleaning Services in New Haven, CT

New haven Air Duct Cleaning Services in New Haven, CT is at 35 Anita St, New Haven, CT 06511 and lists (475) 800-0020. Two reviews at raw 5.0 adjusted to 4.779. The 0.015 gap demonstrates continued downward adjustment. The category Services suggests the firm may focus on cleaning rather than full system replacement.

How to choose

Verify the S-1 license on the Connecticut eLicense portal before requesting a quote. Confirm the contractor participates in the Energize CT network if any state or utility rebate is expected. Compare the Bayesian-adjusted score rather than raw stars when review counts differ sharply. Ask which funding source each line item in the quote uses, because federal credits have expired while state oil-to-heat-pump incentives remain available.

Cost

Installed costs for a full system in the county range from $10,700 to $13,100 according to one data set. A second 2025 invoice sample reports an average of $25,980 and an upper quartile of $35,630. Labor is published at $150 per hour. Permit fees run $200-$600 depending on the municipality. The two cost sources diverge because the higher set captures complex oil-to-heat-pump retrofits common in the county. Homeowners should request line-item breakdowns that separate equipment, labor and permit costs.

Climate

New Haven County falls in IECC zone 5A with 5,800 heating degree days and only 700 cooling degree days. Winter design temperature reaches 5 °F while summer design sits at 90 °F. The load profile is heating-leaning and humid in summer. Legacy fuel-oil systems remain common, which drives conversion work. Equipment must be sized for the heating load first; oversizing for cooling risks short-cycling and poor dehumidification. Cold-climate heat pumps with auxiliary heat are the dominant engineering recommendation.

Licensing and permits

The Connecticut Department of Consumer Protection Heating, Piping, Cooling, and Sheet Metal Examining Board issues the S-1 Unlimited Heating, Piping, and Cooling Contractor license. This license covers the full scope of HVAC work. The state imposes no uniform bond requirement on S-1 holders, though general liability is customary and workers’ compensation is mandatory for any employer with employees. Mechanical permits are required under the state building code and are issued by the local town building department where the work occurs. Fees and inspection schedules therefore vary by municipality.

Incentives

Connecticut Home Energy Rebates through DEEP are approved for launch in late 2025 or early 2026, with heat-pump rebates up to $8,000. Energize CT utility programs offer $500-$15,000 and require an approved participating contractor. No state tax credit exists for HVAC equipment. Federal 25C and 25D credits expired at the end of 2025; only commercial 48E credits remain. Because nearly every available dollar routes through the Energize CT network, homeowners should limit conversations to contractors already on that list.