Top 7 HVAC companies in Plymouth, Massachusetts

Plymouth County contains 521202 residents across a heating-dominant climate zone. Public listings show limited review depth for HVAC work. The ranking uses a Bayesian adjustment that pulls every raw rating toward the national mean of 4.764. Only companies with published addresses and listing categories appear here. All seven operate as general contractors. One lists 24/7 availability and a website; the rest rely on small numbers of five-star scores.

The shortlist

Duxbury Heating and Air

Duxbury Heating and Air operates from 459 Washington St #248, Duxbury, MA 02332. Its phone number is (781) 928-8749. The listing shows a general-contractor category plus published 24/7 availability. Four reviews produced a raw 5.0 that the model adjusted downward to 4.792 because the count is too small to overcome the national mean pull. These numbers cannot reveal how the firm handles complex duct modifications or oil-to-heat-pump conversions.

KB Mini Splits

KB Mini Splits is located at 94 Carver Rd, Plymouth, MA 02360. Its phone number is (508) 301-7716. The general-contractor listing includes a public website but no 24/7 claim. Six reviews at raw 5.0 adjusted to 4.803, still drawn toward 4.764 by limited sample size. The data do not indicate experience with high-volume commercial loads or emergency oil-burner service.

Northstar Refrigeration Inc.

Northstar Refrigeration Inc. lists its address as 95 Camelot Dr #1, Plymouth, MA 02360. Its phone number is (508) 888-3692. The general-contractor entry carries a website. Six reviews at raw 5.0 adjusted to 4.803 for the same reason as the prior firm. Nothing in the listing speaks to refrigerant-handling capacity on systems under ten tons.

A C Unlimited

A C Unlimited is based at 8 Shaw Rd, Carver, MA 02330. Its phone number is (508) 866-8422. The general-contractor listing includes a website. Five reviews at raw 5.0 adjusted to 4.798. The modest review total keeps the score near the mean. The numbers supply no information on sheet-metal fabrication skills or multi-zone heat-pump performance.

Heating & Cooling Services

Heating & Cooling Services lists its address as 11 Memorial Dr, Plymouth, MA 02360. No phone number appears in the public record. The general-contractor category shows neither website nor 24/7 availability. Zero reviews produced an adjusted rating of 4.764 identical to the national mean. These figures reveal nothing about actual service capacity or response times.

Plymouth Heating & Cooling

Plymouth Heating & Cooling operates from 130 Camelot Dr, Plymouth, MA 02360. No phone number is published. The general-contractor listing contains no website or 24/7 notation. Zero reviews again yield the mean-adjusted score of 4.764. The absence of data leaves open every question about licensing compliance and workmanship.

Heating and Air Conditioning

Heating and Air Conditioning is located at 164d Summer St, Kingston, MA 02364. Its phone number is (781) 294-3508. The general-contractor entry lists neither website nor 24/7 availability. Eight reviews at raw 4.5 adjusted upward to 4.708 because the score sits below the national mean. The modest count still limits how far the adjustment can move.

How to choose

Companies are ranked by a Bayesian-adjusted rating that pulls each star rating toward the national mean of 4.764 until review volume is large enough for the raw score to stand alone. A public website, HVAC-specialist category, and published 24/7 availability supply small tie-breakers. This shortlist is built from public listing data, not a review of work performed.

Cost

Modeled typical full-system installation cost is $12,550, with published bounds of $11,300 to $13,800. Invoiced 2025 averages reach $23,586 while the upper quartile sits at $33,537. Labor is stated at $160 per hour and local permit fees range from $200 to $650. Both sources therefore appear in the record; the invoiced average is roughly twice the modeled typical price.

Climate

Plymouth County sits in IECC zone 5A with 5700 heating degree days against only 700 cooling degree days. Boston design temperatures are 9 °F winter and 90 °F summer. The load profile is heating-leaning mixed, with humid summers and dry winters. Primary heating fuels remain natural gas and fuel oil. Cold-climate heat pumps are suitable with backup, and aggressive electrification incentives are pushing conversions from oil and gas.

Licensing and permits

Massachusetts issues no single HVAC contractor license. Refrigeration Technician licensure applies only to systems of 10 tons or greater. Gas fitting, electrical work and sheet metal each require their own state licenses. The Massachusetts Division of Occupational Licensure maintains the lookup at https://www.mass.gov/division-of-occupational-licensure-check-a-license. General liability insurance is often required by towns for permits; workers’ compensation is mandatory for employers. Mechanical permits themselves are issued locally under 780 CMR.

Incentives

Mass Save delivers the largest state heat-pump rebates, up to $8,000 plus utility incentives from $1,250 to $10,000 or more. The program requires participation in the Mass Save Heat Pump Installer Network and a pre-install energy assessment. Municipal light plant customers are ineligible. The federal 25C and 25D credits expired at the end of 2025; only commercial 48E incentives remain. Homeowners must confirm their utility before relying on any quoted rebate total.