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10 Best HVAC Companies in Buffalo, NY

T-Mark Plumbing, Heating & Cooling, JP Heating & Cooling and Isaac Heating and Air Conditioning lead this list of Buffalo's ten best-reviewed HVAC companies, chosen by checking each against Google's own ranking order, review volume, and what their sites and crews can actually back up.

  • Last reviewed September 2026
  • 10 companies reviewed · How We Rank

Our top 10 hvac companies in Buffalo

Buffalo winters run long, and lake effect snow can bury a furnace's outdoor components in a single afternoon, so a heating system that fails in January is not a next-week problem, it is a same-day one. The city's housing stock skews older, with plenty of homes built before mid-century still running boilers and galvanized supply lines that any new HVAC work has to account for, and a company used to that combination matters more here than it would in a newer suburb. New York does not run a single statewide HVAC contractor license the way some states do; Buffalo and Erie County handle registration and permitting locally, so the right move before hiring is a direct question about which local permits the company pulls, alongside a check with the City of Buffalo's permit office rather than assuming a state license lookup will cover it.

  1. T-Mark Plumbing, Heating & Cooling - Buffalo

    Best for 24/7 plumbing, HVAC and electrical in one call4.9(4442 Google reviews)577 Englewood AveBest for homeowners who want one 24/7 crew for HVAC, plumbing and electrical    Rank01

    Why we picked them

    T-Mark holds a 4.9 rating from 4,442 Google reviews, read September 21, 2026, the largest review count on this list, backed by 25-plus years covering plumbing, heating, cooling and electrical from one 24/7 dispatch.

    What we like

    • 24-hour dispatch every day covering four trades
    • Generac generator dealer for storm-related outages
    • Office replies to reviews by name, naming and thanking specific technicians

    Things to consider

    • A recent review describes a tankless water heater installed with reversed venting; ask about post-install CO inspection before booking gas appliance work

    Services

    • AC repair
    • AC installation
    • Furnace repair
    • Maintenance plans

    Key details

    Best for
    homeowners who want one 24/7 crew for HVAC, plumbing and electrical
    Service area
    Buffalo
    Emergency service
    Available
    Financing
    Available
    Credentials
    Generac Generator Dealer

  2. JP Heating & Cooling, LLC

    Best for a small, owner-led shop without upselling5.0(211 Google reviews)2060 Niagara StBest for homeowners who want a small, owner-operated HVAC shop over a large dispatch company    Rank02

    Why we picked them

    JP Heating & Cooling carries a perfect 5.0 rating from 211 Google reviews, read September 21, 2026, with a recurring theme of owner Jim explaining the diagnosis rather than pushing unnecessary equipment.

    What we like

    • Owner Jim personally quotes and often works jobs
    • Reviewers repeatedly describe no-upsell, straight-talk pricing
    • Services a wide range of brands including Carrier, Bryant and Daikin

    Things to consider

    • Standard hours are weekdays only, 7am to 5pm, with weekend service by appointment

    Services

    • AC repair
    • AC installation
    • Furnace repair
    • Maintenance plans

    Key details

    Best for
    homeowners who want a small, owner-operated HVAC shop over a large dispatch company
    Service area
    Buffalo
    Years in business
    47 years
    Financing
    Available

  3. Isaac Heating and Air Conditioning

    Best for a large regional company with 24-hour dispatch4.9(1048 Google reviews)70 Benbro DrBest for homeowners who want a large regional HVAC company with 24-hour dispatch    Rank03

    Why we picked them

    Isaac Heating and Air Conditioning holds a 4.9 rating from 1,048 Google reviews, read September 21, 2026, with a review describing the company as the only one willing to service an old wall-unit gas heater others had turned away.

    What we like

    • 24-hour service with upfront pricing and free replacement estimates
    • Plumbing license PLMB-276 and a Lennox dealer designation
    • CareClub membership plan for ongoing maintenance

    Things to consider

    • Buffalo is one branch of a larger regional company based primarily in Rochester

    Services

    • AC repair
    • AC installation
    • Furnace repair
    • Maintenance plans

    Key details

    Best for
    homeowners who want a large regional HVAC company with 24-hour dispatch
    Service area
    Buffalo
    Emergency service
    Available
    Financing
    Available
    Credentials
    Plumbing license

  4. Adema Heating & Air Conditioning Inc

    Best for a century-plus family-owned company4.8(496 Google reviews)378 Englewood AveBest for homeowners who want a century-plus family HVAC company with Lennox certification    Rank04

    Why we picked them

    Adema Heating & Air Conditioning holds a 4.8 rating from 496 Google reviews, read September 21, 2026, and multiple reviewers describe pricing well below several competing quotes without aggressive upselling.

    What we like

    • Family-owned since 1873, now in its fourth generation
    • Lennox Premier Dealer with NATE certification and Energy Star recognition
    • No-interest financing and 24-hour emergency call-out

    Things to consider

    • One commercial customer reported a paid repair that failed again within about a week

    Services

    • AC repair
    • AC installation
    • Furnace repair
    • Heat pump installation
    • Maintenance plans

    Key details

    Best for
    homeowners who want a century-plus family HVAC company with Lennox certification
    Service area
    Buffalo
    Years in business
    153 years
    Emergency service
    Available
    Financing
    Available
    Credentials
    NATE Certification

  5. Zenner & Ritter Home Services

    Best for combined heating, plumbing and generator work4.9(5922 Google reviews)3404 Bailey Ave, Buffalo, NY 14215Best for water heater and sump pump replacement in Buffalo homes, alongside heating work    Rank05

    Why we picked them

    Zenner & Ritter Home Services holds a 4.9 rating from 5,922 Google reviews, read September 21, 2026, the deepest review base of any company on this list, citing 95 years in the Buffalo market.

    What we like

    • Heating, plumbing, air quality and generators from one dispatch
    • Generac dealer for standby power installation and service
    • Nearly 6,000 Google reviews, the largest sample on this list

    Things to consider

    • Weekend hours are shorter, with Sunday coverage ending at 1pm

    Services

    • Water heater repair
    • AC repair
    • Furnace repair
    • Heat pump installation
    • Maintenance plans

    Key details

    Best for
    water heater and sump pump replacement in Buffalo homes, alongside heating work
    Service area
    Buffalo
    Emergency service
    Available
    Financing
    Available
    Credentials
    Generac Generator Dealer

  6. O'Donnell Heating & Air Conditioning Inc - Buffalo

    Best for a written repair guarantee4.7(437 Google reviews)2032 Eggert RdBest for homeowners who want a decades-old, owner-led company with a written repair guarantee    Rank06

    Why we picked them

    O'Donnell Heating & Air Conditioning holds a 4.7 rating from 437 Google reviews, read September 21, 2026, and publishes a two-year repair guarantee that few competitors in this market state in writing.

    What we like

    • Published two-year guarantee on repairs
    • Owner Jim O'Donnell still personally quotes jobs after six decades
    • Lennox Premier Dealer, also installs Anzel zoning and Navien tankless systems

    Things to consider

    • 4.7 rating is the most conservative among the HVAC companies on this list

    Services

    • AC repair
    • AC installation
    • Furnace repair
    • Heat pump installation
    • Maintenance plans

    Key details

    Best for
    homeowners who want a decades-old, owner-led company with a written repair guarantee
    Service area
    Buffalo
    Years in business
    65 years
    Warranty
    Two-year guarantee on repairs
    Financing
    Available
    Credentials
    Lennox Premier Dealer

  7. Climate Diagnostics LLC

    Best for mini-split and ductless installation5.0(71 Google reviews)59 Zittel StBest for mini-split installation and repair from a single, hands-on Buffalo technician    Rank07

    Why we picked them

    Climate Diagnostics LLC holds a perfect 5.0 rating from 71 Google reviews, read September 21, 2026, with every review naming owner Brian Lorek directly for hands-on mini-split and furnace work.

    What we like

    • Authorized RUUD and Mitsubishi dealer for ductless systems
    • Owner Brian Lorek personally handles every job
    • One-year labor warranty on top of manufacturer coverage

    Things to consider

    • Single-technician operation, so scheduling capacity is naturally limited

    Services

    • AC repair
    • AC installation
    • Furnace repair
    • Heat pump installation
    • Maintenance plans

    Key details

    Best for
    mini-split installation and repair from a single, hands-on Buffalo technician
    Service area
    Buffalo
    Warranty
    One-year labor warranty on every installation, plus manufacturer's warranty
    Emergency service
    Available
    Credentials
    RUUD Authorized Dealer

  8. Cellino Plumbing, Heating, Cooling & Electric

    Best for plumbing, HVAC and electrical under one roof4.9(2660 Google reviews)5635 Harris Hill Rd Ste 6B, Williamsville, NY 14221Best for homeowners who want one contractor covering plumbing, HVAC and electrical across Western New York    Rank08

    Why we picked them

    Cellino Plumbing, Heating, Cooling & Electric holds a 4.9 rating from 2,660 Google reviews, read September 4, 2026, with a rare in-house combination of plumbing, HVAC, electrical and excavation.

    What we like

    • Plumbing, heating, cooling, electrical and generators all in house
    • Underground excavation capability for sewer and water line work
    • Published after-hours warranty reimbursement policy up to $300

    Things to consider

    • Google lists 24-hour opening, but the company's own site says overnight dispatch is currently paused

    Services

    • Emergency plumbing
    • Drain cleaning
    • AC repair
    • AC installation
    • Furnace repair
    • Heat pump installation
    • Maintenance plans

    Key details

    Best for
    homeowners who want one contractor covering plumbing, HVAC and electrical across Western New York
    Service area
    Buffalo
    Years in business
    32 years

  9. The Cool Factory Heating & Cooling

    Best for a small, owner-operated shop with continuity5.0(106 Google reviews)506 Ivyhurst Rd NBest for homeowners who want a small, locally owned HVAC company with a personal touch    Rank09

    Why we picked them

    The Cool Factory Heating & Cooling holds a perfect 5.0 rating from 106 Google reviews, read September 21, 2026, with reviews spanning several years of repeat service from the same owner-operator.

    What we like

    • Owner Dave named directly across years of repeat customer reviews
    • Free replacement estimates with a disclosed $80 diagnostic fee
    • Reviewers describe continued availability for questions after the job is done

    Things to consider

    • Small team means scheduling capacity is more limited during peak demand

    Services

    • AC repair
    • AC installation
    • Furnace repair
    • Heat pump installation

    Key details

    Best for
    homeowners who want a small, locally owned HVAC company with a personal touch
    Service area
    Buffalo

  10. PCS Plumbing & Heating Inc

    Best for scheduled plumbing and heating in older South Buffalo homes4.9(324 Google reviews)2286 South Park Ave, Buffalo, NY 14220Best for scheduled plumbing, heating and sewer excavation work in older Buffalo homes    Rank10

    Why we picked them

    PCS Plumbing & Heating Inc holds a 4.9 rating from 323 Google reviews, read September 4, 2026, and covers plumbing, heating and sewer excavation from a single South Buffalo shop.

    What we like

    • Plumbing, HVAC and excavation from one South Park Avenue shop
    • Trading since 2007, with several older local plumbing businesses merged in
    • BBB-linked profile with named owners and office staff

    Things to consider

    • Published hours are weekdays only, 7:30am to 4pm, with no advertised 24-hour emergency service

    Services

    • Sewer line repair
    • AC repair
    • AC installation
    • Furnace repair

    Key details

    Best for
    scheduled plumbing, heating and sewer excavation work in older Buffalo homes
    Service area
    Buffalo
    Years in business
    19 years

Compare the top hvac companies in Buffalo

Ranking position reflects our editorial review, not customer ratings.

Editorial comparison of the 10 ranked companies. Customer ratings, where shown, come from the source named on each company profile.
RankCompanyBest forKey servicesService areaGoogle ratingEmergencyProfile
01T-Mark Plumbing, Heating & Cooling - Buffalohomeowners who want one 24/7 crew for HVAC, plumbing and electricalAC repair, AC installation, Furnace repairBuffalo4.9 (4442)YesView →
02JP Heating & Cooling, LLChomeowners who want a small, owner-operated HVAC shop over a large dispatch companyAC repair, AC installation, Furnace repairBuffalo5.0 (211)Not listedView →
03Isaac Heating and Air Conditioninghomeowners who want a large regional HVAC company with 24-hour dispatchAC repair, AC installation, Furnace repairBuffalo4.9 (1048)YesView →
04Adema Heating & Air Conditioning Inchomeowners who want a century-plus family HVAC company with Lennox certificationAC repair, AC installation, Furnace repairBuffalo4.8 (496)YesView →
05Zenner & Ritter Home Serviceswater heater and sump pump replacement in Buffalo homes, alongside heating workWater heater repair, AC repair, Furnace repairBuffalo4.9 (5922)YesView →
06O'Donnell Heating & Air Conditioning Inc - Buffalohomeowners who want a decades-old, owner-led company with a written repair guaranteeAC repair, AC installation, Furnace repairBuffalo4.7 (437)Not listedView →
07Climate Diagnostics LLCmini-split installation and repair from a single, hands-on Buffalo technicianAC repair, AC installation, Furnace repairBuffalo5.0 (71)YesView →
08Cellino Plumbing, Heating, Cooling & Electrichomeowners who want one contractor covering plumbing, HVAC and electrical across Western New YorkEmergency plumbing, Drain cleaning, AC repairBuffalo4.9 (2660)Not listedView →
09The Cool Factory Heating & Coolinghomeowners who want a small, locally owned HVAC company with a personal touchAC repair, AC installation, Furnace repairBuffalo5.0 (106)Not listedView →
10PCS Plumbing & Heating Incscheduled plumbing, heating and sewer excavation work in older Buffalo homesSewer line repair, AC repair, AC installationBuffalo4.9 (324)Not listedView →

HVAC companies serving Buffalo and nearby areas

Most companies in this ranking work across New York and the surrounding suburbs. Coverage and travel fees vary, so confirm your address is inside the service area before scheduling.

  • Buffalo
  • West Seneca
  • Tonawanda
  • Hamburg
  • Amherst

Nearby rankings

Buffalo, New York

Service coverage across Buffalo. Individual company areas are listed on each profile.

How we chose the best hvac companies in Buffalo

Read our full ranking methodology →

Every company on this list was checked against Google's own ranking order for two searches run September 21, 2026: "HVAC contractor in Buffalo, NY" and "HVAC company Buffalo," plus neighborhood-variant searches to fill out the list to ten. We kept companies rated 4.5 stars or higher with at least 50 reviews, an operating status, a real website, and a location genuinely inside Buffalo rather than a neighboring suburb with a Buffalo mailing address. No company paid for placement or a review, and this list will be reviewed again as ratings and review counts change.

How to choose a hvac company in Buffalo

  • Verify insurance and credentials

    Ask for a current certificate of insurance and confirm registration or licensing with the authority that issues it, not with the company.

  • Ask for a written estimate

    Scope, materials, removal, disposal and who pulls the permit should all be named on the page rather than agreed on the doorstep.

  • Compare multiple quotes

    Two or three bids on the same scope. A number far below the others usually means something has been left out of it.

  • Understand the warranty

    Separate the manufacturer's warranty on materials from the company's own warranty on the work, and get both in writing.

  • Ask who performs the work

    Find out whether the crew are employees or subcontractors, and who supervises them on the day.

  • Check recent local projects

    Ask for addresses or photographs of comparable jobs finished nearby in the last year or two.

  • Avoid high-pressure sales

    A discount that expires today, or a knock on the door after a storm, is a reason to slow down rather than sign.

  • Get everything in writing

    Change orders, timeline and payment schedule included, before the first payment changes hands.

Questions to ask before hiring

  • Are you insured, and can you send the certificate?
  • How long have you worked in this area?
  • Will you provide a written estimate with materials listed?
  • What warranty do you offer on the work itself?
  • Do you use subcontractors for this job?
  • Who handles permits and inspection?
  • What would you recommend here, and why?
  • How are unexpected costs handled once work starts?
  • What is the estimated timeline from start to finish?
  • Can you provide recent local references?

Red flags

  • No verifiable local business address or registration
  • Pressure to sign on the first visit
  • A demand for full payment up front
  • An offer to cover or waive your insurance deductible
  • Refusal to put warranty terms in writing
  • A quote that will not itemize scope

Related home services in Buffalo

HVAC guides for Buffalo homeowners

HVAC companies in Buffalo FAQs

  • Does New York require an HVAC contractor license in Buffalo?

    New York does not run one statewide HVAC contractor license the way some states do. Buffalo and Erie County handle registration and permitting locally, so ask which permits a company pulls for your job and confirm with the City of Buffalo's permit office rather than relying on a single state lookup.

  • How much does HVAC maintenance cost in Buffalo?

    Costs vary by company and system size, but several companies on this list publish specific numbers: O'Donnell charges $79 plus tax for a maintenance call, and The Cool Factory charges an $80 diagnostic fee for repair visits. Ask for a maintenance plan's full terms, since an annual contract can cost less over time than paying for each visit separately.

  • Why do Buffalo furnaces need more attention than furnaces in milder climates?

    Buffalo's long winters and frequent stretches below freezing put real strain on a heating system, and lake effect snow can bury outdoor components like heat pump condensers in a single storm. Several companies on this list recommend a fall tune-up before the first hard freeze, since a mid-winter failure is a same-day emergency rather than a scheduling inconvenience.

About this ranking

Originally published
September 2026
Last reviewed
September 2026
Companies evaluated
10

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