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10 Best HVAC Companies in Mississauga, ON

Reliance Heating, Air Conditioning & Plumbing leads this list of hvac in Mississauga. Positions follow the order these companies appear in Google Maps for this trade and city, read on September 27, 2026. Every profile records where its rating and contact details came from.

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

Our top 10 hvac companies in Mississauga

Ontario regulates HVAC contractors through the Technical Standards and Safety Authority (TSSA), which licenses the gas fitters and refrigeration mechanics who install and service furnaces, air conditioners, and heat pumps. Mississauga's mix of established subdivisions, newer high-rise condos, and a large commercial and light-industrial base near Pearson Airport means the right HVAC company can vary by the job: a condo owner needs different service than a homeowner with an aging furnace in Streetsville or Clarkson. This ranking covers companies with a genuine, physical Mississauga location, not simply a Google listing that mentions the city while the company is actually based in Brampton or elsewhere in the GTA.

  1. Reliance Heating, Air Conditioning & Plumbing

    24/7 HVAC with furnace and AC rental options4.8(22768 Google reviews)335 Britannia Rd EBest for 24/7 HVAC with furnace and AC rental options    Rank01

    Why we picked them

    A review base past 22,000, a Great Place to Work certification, and genuine 24/7/365 coverage backed by a $500 installation guarantee give Reliance a scale few local competitors can match.

    What we like

    • 4.8 stars across 22,768 reviews, by far the largest review base in this ranking
    • 60+ years in business across Ontario
    • ESA licensed, WSIB cleared, and BBB accredited
    • Genuine 24/7/365 service with a $500 installation guarantee
    • Furnace, AC, and water heater rental options starting around $19.99/month

    Things to consider

    • Being a large national brand, service can feel less personal than a small local shop
    • Rental programs may cost more over time than an outright purchase
    • Specific TSSA licence number isn't published on the site

    Services

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

    Key details

    Best for
    24/7 HVAC with furnace and AC rental options
    Service area
    Mississauga
    Emergency service
    Available
    Financing
    Available

  2. Glors Heating and Air Conditioning

    Furnace and AC installation with a 10-year warranty4.9(531 Google reviews)1426 Pate CtBest for Furnace and AC installation with a 10-year warranty    Rank02

    Why we picked them

    A stated 10-year parts and labour warranty, on top of Trane's own lifetime heat exchanger coverage, gives Glors a longer installation guarantee than most competitors in this ranking are willing to put in writing.

    What we like

    • 4.9-star rating from 531 reviews
    • 10-year parts and labour warranty on installations
    • Trane furnaces include a lifetime heat exchanger warranty
    • Genuine 24/7 furnace and AC repair
    • Help navigating government rebate applications, with a stated 100% success rate

    Things to consider

    • No published TSSA licence number
    • Named founder but no wider staff team listed
    • Financing terms aren't detailed beyond "payment options available"

    Services

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

    Key details

    Best for
    Furnace and AC installation with a 10-year warranty
    Service area
    Mississauga
    Warranty
    10 years parts and labour on installations; Trane furnaces include a lifetime heat exchanger warranty
    Emergency service
    Available

  3. HVAC-Group

    same-day furnace and AC breakdowns across Mississauga and the west GTA5.0(279 Google reviews)1767 Branchwood Park, Mississauga, ON L4W 2E5, CanadaBest for same-day furnace and AC breakdowns across Mississauga and the west GTA    Rank03

    Why we picked them

    The review record is the headline: a flat 5 out of 5 across 279 Google reviews, read on September 27, 2026, is rare and hard to fake at that volume. Combine that with genuinely long weekday hours and a service list that runs from ductless splits to tankless water heaters, and this is a sensible first call for a Mississauga breakdown. We would still pin down the diagnostic fee and the after-hours rate before anyone is dispatched.

    What we like

    • 5 out of 5 from 279 Google reviews, read on September 27, 2026
    • Weekday hours to 9 PM plus weekend coverage, with 24/7 emergency service advertised
    • Covers heating, cooling, heat pumps and water heaters under one contractor
    • Ductless mini-split work suits older Mississauga homes without full ductwork
    • Service area extends through Brampton, Oakville, Milton, Etobicoke, Toronto and Vaughan
    • Gas line installation and leak repair handled in house

    Things to consider

    • No pricing, diagnostic fee or after-hours rate published, so confirm on the call
    • Licence, insurance and gas fitter credentials are not stated in the listing and should be verified
    • Published hours and the advertised 24/7 emergency service do not match, so clarify what is available overnight
    • Website review count differs from the Google profile count, so treat the profile figure as current

    Services

    • Furnace repair
    • Heat pump installation

    Key details

    Best for
    same-day furnace and AC breakdowns across Mississauga and the west GTA
    Service area
    Mississauga

  4. Absolute Comfort Heating & Air Conditioning

    Residential heating and cooling installation and repair4.9(228 Google reviews)2133 Royal Windsor Dr UnitBest for Residential heating and cooling installation and repair    Rank04

    Why we picked them

    A 4.9-star average across 228 reviews reflects a strong local reputation, though this profile is lighter on independently verified detail than others in this ranking since the company's own site couldn't be crawled for confirmation.

    What we like

    • 4.9-star rating from 228 reviews
    • Established Mississauga location on Royal Windsor Drive
    • Strong local reputation reflected in its review base

    Things to consider

    • Company website could not be independently verified for this profile
    • Specific brands, warranty terms, and licence number are not confirmed here
    • Ask directly about TSSA licensing and emergency availability before booking

    Services

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

    Key details

    Best for
    Residential heating and cooling installation and repair
    Service area
    Mississauga
    Credentials
    HRAI member

  5. MH Heating and Cooling Solutions

    24/7 furnace and AC service with a 24-month warranty5.0(216 Google reviews)2798 Termini TerraceBest for 24/7 furnace and AC service with a 24-month warranty    Rank05

    Why we picked them

    A perfect 5.0-star average, genuine 24/7 hours, and a stated 24-month secure warranty on installations make MH a strong all-around pick across a wide swath of the GTA.

    What we like

    • Perfect 5.0-star rating from 216 reviews
    • Genuinely open 24/7 with a dedicated emergency line
    • 24-month secure warranty on installations
    • Broad brand lineup including Carrier, Bryant, and Mitsubishi
    • Serves a wide swath of the GTA beyond Mississauga alone

    Things to consider

    • No published TSSA licence number
    • No individual owner or staff named on the site
    • Financing terms aren't detailed beyond a link

    Services

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

    Key details

    Best for
    24/7 furnace and AC service with a 24-month warranty
    Service area
    Mississauga
    Warranty
    24-month secure warranty on installations
    Emergency service
    Available
    Financing
    Available

  6. Enercare

    homeowners wanting one provider for furnace, AC, water heater and plumbing, including after-hours calls4.7(3348 Google reviews)4020 B Sladeview Crescent, Mississauga, ON L5L 6B1, CanadaBest for homeowners wanting one provider for furnace, AC, water heater and plumbing, including after-hours calls    Rank06

    Why we picked them

    A national operator with genuine 24 hour coverage and a review count that dwarfs the local field, which is exactly what you want at two in the morning in February. The trade-off is the rental and plan model, which is convenient but carries contract terms that outlive the enthusiasm of the sales conversation, so read them properly. For a simple repair, get a quote from a local independent too and compare.

    What we like

    • 4.7 from 3,348 Google reviews on the Mississauga profile, read September 27, 2026
    • Published 24 hour availability, seven days a week
    • Covers heating, cooling, water heaters, plumbing and electrical under one provider
    • Fixed-price quotes including parts and labour, per its own website
    • Licence number 7010500 published publicly
    • Rental and protection plan options for people avoiding a large upfront cost

    Things to consider

    • Rental and plan agreements carry terms and buyout schedules that should be read before signing
    • A small independent contractor may be cheaper for a straightforward part replacement
    • Service quality with a large operator varies by the technician assigned
    • The review total quoted on the company website covers all regions, not this location

    Services

    • Furnace repair
    • Duct cleaning

    Key details

    Best for
    homeowners wanting one provider for furnace, AC, water heater and plumbing, including after-hours calls
    Service area
    Mississauga
    Credentials
    HVAC licence

  7. Aire One Peel

    24/7 furnace and AC repair with no after-hours surcharge4.9(678 Google reviews)1625 Courtneypark Dr EBest for 24/7 furnace and AC repair with no after-hours surcharge    Rank07

    Why we picked them

    Thirty-five years in the Peel Region and a stated no-surcharge policy on nights, weekends, and holidays make Aire One Peel a dependable, cost-predictable choice for an after-hours breakdown.

    What we like

    • 4.9 stars across 678 reviews
    • 35 years in the Peel Region since 1990
    • TSSA certified and BBB accredited
    • 24/7 availability with no after-hours surcharge
    • 100% customer satisfaction guarantee on all work

    Things to consider

    • Specific brands installed aren't named on the site
    • Office hours for non-emergency scheduling are limited on weekends
    • Rent-or-buy financing terms aren't detailed

    Services

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

    Key details

    Best for
    24/7 furnace and AC repair with no after-hours surcharge
    Service area
    Mississauga
    Years in business
    36 years
    Emergency service
    Available
    Financing
    Available

  8. Airmaxx Heating & Air Conditioning Inc.

    Furnace, AC, and specialty heating work including oil-to-gas conversions4.9(98 Google reviews)1265 Ogden AveBest for Furnace, AC, and specialty heating work including oil-to-gas conversions    Rank08

    Why we picked them

    An unusually wide service list, stretching to oil-to-gas conversions and radiant-floor heating, backed by genuine TSSA certification, makes Airmaxx worth a call for a less common HVAC job.

    What we like

    • 4.9-star rating from 98 reviews
    • TSSA certified, serving the GTA from Mississauga since 2010
    • Unusually wide service list including oil-to-gas conversions and radiant-floor heating
    • Installs a broad range of brands including Mitsubishi Electric, Carrier, and York
    • 24-hour emergency service

    Things to consider

    • Smaller review count than the top names in this ranking
    • No individual staff named on the site
    • Warranty and financing terms aren't detailed

    Services

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

    Key details

    Best for
    Furnace, AC, and specialty heating work including oil-to-gas conversions
    Service area
    Mississauga
    Years in business
    16 years
    Emergency service
    Available
    Credentials
    TSSA Certified

  9. High Class Cooling & Heating Systems

    Residential and commercial HVAC installation and repair5.0(127 Google reviews)2810 Matheson Blvd E Suite 600, Office 105Best for Residential and commercial HVAC installation and repair    Rank09

    Why we picked them

    A perfect 5.0-star average across 127 reviews reflects a strong local reputation, though this profile is lighter on independently verified detail than others in this ranking since the company's own site couldn't be crawled for confirmation.

    What we like

    • Perfect 5.0-star rating from 127 reviews
    • Established Mississauga location on Matheson Boulevard
    • Strong local reputation reflected in its review base

    Things to consider

    • Company website could not be independently verified for this profile
    • Specific brands, warranty terms, and licence number are not confirmed here
    • Ask directly about TSSA licensing and emergency availability before booking

    Services

    • AC repair
    • AC installation
    • Maintenance plans

    Key details

    Best for
    Residential and commercial HVAC installation and repair
    Service area
    Mississauga
    Years in business
    11 years
    Emergency service
    Available

  10. Maher Heating & Cooling

    Mississauga homeowners wanting one contractor for heating, cooling and hot water, including financed replacements4.7(276 Google reviews)Matheson Blvd E, Mississauga, ON L4Z 1N8, CanadaBest for Mississauga homeowners wanting one contractor for heating, cooling and hot water, including financed replacements    Rank10

    Why we picked them

    A broad service list and 276 reviews at 4.7 put this firm in the credible middle of a crowded Mississauga market, and the water treatment and air sealing lines give it more reach than the average furnace-and-AC shop. The heavy promotion of monthly payment plans is the thing to read carefully: the numbers look attractive, but the terms decide whether they are. Ask for the total cost over the full term before you sign anything.

    What we like

    • 4.7 rating from 276 reviews on its Google Business Profile, read September 27, 2026
    • Unusually broad scope for a residential firm, covering water treatment, air quality and air sealing as well as HVAC
    • Hours published as 24 a day, seven days a week, useful for winter furnace failures
    • Claims 27-plus years in the trade and advertises ten-year parts and labour warranties on installations
    • Financing and monthly-payment options presented openly, with rebate figures quoted

    Things to consider

    • Monthly plan pricing needs checking for term length, ownership and total cost before signing
    • Rebate amounts up to $5,000 are the company's own claim and depend on programs current at the time
    • Overnight and weekend calls typically carry a premium rate, which the profile does not list

    Services

    • Heat pump installation

    Key details

    Best for
    Mississauga homeowners wanting one contractor for heating, cooling and hot water, including financed replacements
    Service area
    Mississauga

Compare the top hvac companies in Mississauga

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
01Reliance Heating, Air Conditioning & Plumbing24/7 HVAC with furnace and AC rental optionsAC repair, AC installation, Furnace repairMississauga4.8 (22768)YesView →
02Glors Heating and Air ConditioningFurnace and AC installation with a 10-year warrantyAC repair, AC installation, Furnace repairMississauga4.9 (531)YesView →
03HVAC-Groupsame-day furnace and AC breakdowns across Mississauga and the west GTAFurnace repair, Heat pump installationMississauga5.0 (279)Not listedView →
04Absolute Comfort Heating & Air ConditioningResidential heating and cooling installation and repairAC repair, AC installation, Furnace repairMississauga4.9 (228)Not listedView →
05MH Heating and Cooling Solutions24/7 furnace and AC service with a 24-month warrantyAC repair, AC installation, Furnace repairMississauga5.0 (216)YesView →
06Enercarehomeowners wanting one provider for furnace, AC, water heater and plumbing, including after-hours callsFurnace repair, Duct cleaningMississauga4.7 (3348)Not listedView →
07Aire One Peel24/7 furnace and AC repair with no after-hours surchargeAC repair, AC installation, Furnace repairMississauga4.9 (678)YesView →
08Airmaxx Heating & Air Conditioning Inc.Furnace, AC, and specialty heating work including oil-to-gas conversionsAC repair, AC installation, Furnace repairMississauga4.9 (98)YesView →
09High Class Cooling & Heating SystemsResidential and commercial HVAC installation and repairAC repair, AC installation, Maintenance plansMississauga5.0 (127)YesView →
10Maher Heating & CoolingMississauga homeowners wanting one contractor for heating, cooling and hot water, including financed replacementsHeat pump installationMississauga4.7 (276)Not listedView →

HVAC companies serving Mississauga and nearby areas

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

  • Mississauga
  • Toronto
  • Hamilton
  • North York
  • Scarborough
  • Oakville
  • Burlington
  • Brampton
  • Caledon
  • Vaughan
  • Milton
  • Concord

Nearby rankings

Mississauga, Ontario

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

How we chose the best hvac companies in Mississauga

Read our full ranking methodology →

Companies were sourced from Google Maps search results for HVAC, heating, and air conditioning services in Mississauga, ON, merged across multiple search phrasings and de-duplicated by Google place ID. Each candidate was checked against a 4.5-star minimum rating, a minimum of 50 Google reviews, an active company website, correct trade classification, and a genuine Mississauga address. Peel Heating & Air Conditioning was excluded despite a strong review count because its listed address is in Brampton, ON, a separate city. Two entries, Absolute Comfort Heating & Air Conditioning and High Class Cooling & Heating Systems, are included on the strength of their Google review record, but their own websites could not be crawled for independent verification of licensing, brands, or warranty details, which is disclosed on their profiles.

How to choose a hvac company in Mississauga

  • 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 Mississauga

HVAC guides for Mississauga homeowners

HVAC companies in Mississauga FAQs

  • Do HVAC contractors need a license in Ontario?

    Yes. Ontario licenses gas fitters and refrigeration and air conditioning mechanics through the Technical Standards and Safety Authority (TSSA). Ask any company for its TSSA licence number and confirm it before signing a contract.

  • Why isn't Peel Heating & Air Conditioning on this list?

    Peel Heating & Air Conditioning has a strong review record, but its listed address is in Brampton, ON, a separate city from Mississauga, so it falls outside this ranking's scope.

  • How often should a furnace be serviced in Mississauga?

    Most technicians recommend an annual furnace tune-up in the fall, before Ontario's heating season puts sustained demand on the system through the winter.

About this ranking

Originally published
September 2026
Last reviewed
September 2026
Companies evaluated
10

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