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10 Best HVAC Companies in Denver, CO

Golden West Plumbing, Heating, Air Conditioning, and Electrical, Ultimate Heating, Cooling, Plumbing & Electric, and Heart Heating, Cooling, Plumbing & Electric top this list of Denver's ten best-reviewed HVAC companies, each vetted for a Google rating of 4.5 or higher, at least 50 reviews, a real local address, and a working website tied to the business itself.

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

Our top 10 hvac companies in Denver

Denver's climate is the reason HVAC work here looks different from a milder city: winters regularly drop below freezing for weeks at a stretch, and summer afternoons at 5,280 feet can swing 30 degrees from morning to evening, so a furnace and an air conditioner both get real work every year rather than one sitting idle. Housing stock in the metro ranges from pre-war bungalows in Baker and Highland with original ductwork to newer builds in the far northeast that were built for central air from the start, which means load calculations and equipment sizing vary block to block. Colorado does not issue a single statewide HVAC license the way some states do. Plumbing and electrical work on a job site is licensed through the Colorado Department of Regulatory Agencies, which issues the PC, MP, EC, and ME contractor numbers that several companies on this list publish, while mechanical or HVAC-specific work is generally covered through local permitting, most visibly the master mechanical registration one company here holds. Before hiring anyone for a system replacement, ask which of these numbers applies to the work being quoted and confirm it is current.

  1. Golden West Plumbing, Heating, Air Conditioning, and Electrical

    Best for 24/7 emergency repair with no overtime fee4.8(3809 Google reviews)4217 Delaware StBest for 24/7 emergency heating and cooling repair    Rank01

    Why we picked them

    Golden West leads Google's own ranking for Denver HVAC searches with a 4.8 rating from 3,807 reviews and a policy of never charging extra for a middle-of-the-night call.

    What we like

    • Answers calls around the clock without an overtime surcharge
    • Holds Colorado plumbing and electrical contractor licenses
    • A+ Better Business Bureau rating

    Things to consider

    • Founding year is stated inconsistently as 22 or 23 years in business

    Services

    • Emergency plumbing
    • Drain cleaning
    • Water heater repair
    • Fixture installation
    • AC repair
    • AC installation
    • Furnace repair
    • Heat pump installation
    • Duct cleaning
    • Maintenance plans

    Key details

    Best for
    24/7 emergency heating and cooling repair
    Service area
    Denver
    Emergency service
    Available
    Financing
    Available
    Credentials
    Plumbing Contractor License

  2. Ultimate Heating, Cooling, Plumbing & Electric

    Best for Carrier factory-authorized installation4.8(1244 Google reviews)4321 Broadway Unit 3Best for Flat-rate furnace and AC replacement    Rank02

    Why we picked them

    Ultimate holds a 4.8 rating from 1,244 reviews and is one of the only companies on this list certified to install residential geothermal systems alongside standard furnace and AC work.

    What we like

    • Carrier Factory Authorized Dealer with NATE-certified technicians
    • Installs residential geothermal systems, a rare local offering
    • Flat-rate pricing set before work begins

    Things to consider

    • No direct contact email published, only a contact form

    Services

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

    Key details

    Best for
    Flat-rate furnace and AC replacement
    Service area
    Denver
    Years in business
    27 years
    Warranty
    Satisfaction guarantee stated; specific terms not detailed on the site
    Emergency service
    Available
    Financing
    Available
    Credentials
    Plumbing Contractor License

  3. Heart Heating, Cooling, Plumbing & Electric

    Best for combined HVAC and plumbing emergencies4.8(3281 Google reviews)646 Bryant StBest for Same-visit heating, cooling, and drain work    Rank03

    Why we picked them

    Heart carries a 4.8 rating from 3,276 reviews and covers an unusually wide service radius for a company that also runs full plumbing and electrical divisions.

    What we like

    • 24/7 phone coverage for heating, cooling, and plumbing
    • BBB accredited with three active chamber of commerce memberships
    • Service area reaches Boulder, Colorado Springs, and Parker

    Things to consider

    • No founding year or specific license numbers published on the site

    Services

    • Emergency plumbing
    • Drain cleaning
    • Water heater repair
    • Sewer line repair
    • Leak detection
    • AC repair
    • AC installation
    • Furnace repair
    • Heat pump installation

    Key details

    Best for
    Same-visit heating, cooling, and drain work
    Service area
    Denver
    Emergency service
    Available
    Financing
    Available
    Credentials
    BBB Accreditation

  4. Right Away Heating

    Best for a small, family-run shop in Baker4.9(339 Google reviews)340 Santa Fe DrBest for Furnace and boiler repair with same-day dispatch    Rank04

    Why we picked them

    Right Away holds the highest rating in the top four at 4.9 from 339 reviews, with reviewers repeatedly naming the same father-and-son technicians for careful, honest repairs.

    What we like

    • Family-owned for more than 25 years
    • Authorized Carrier dealer
    • Reviewers name technicians Jose and Lucas directly for honest diagnostics

    Things to consider

    • No license numbers published on the site

    Services

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

    Key details

    Best for
    Furnace and boiler repair with same-day dispatch
    Service area
    Denver
    Emergency service
    Available
    Credentials
    Authorized Carrier Dealer

  5. Absolute Plumbing, Electrical, Heating & Air

    Best for whole-home upgrades: HVAC, generators, and EV charging4.8(3969 Google reviews)5590 Havana St Unit ABest for Whole-home systems: furnace, generator, and EV charging in one visit    Rank05

    Why we picked them

    Absolute holds a 4.8 rating from 3,969 reviews and the broadest dealer certifications on this list, though the size of its one detailed complaint means a written scope is worth getting before a major job.

    What we like

    • Generac, American Standard, and Eaton dealer status
    • Same-day financing approval
    • Service area covers more than thirty metro cities

    Things to consider

    • One detailed 2026 review describes a disputed $21,000 HVAC installation

    Services

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

    Key details

    Best for
    Whole-home systems: furnace, generator, and EV charging in one visit
    Service area
    Denver
    Emergency service
    Available
    Financing
    Available
    Credentials
    Plumbing Contractor License

  6. Controlling Systems Heating, AC, and Electrical Repair

    Best for long-tenured, room-by-room mini-split sizing4.9(640 Google reviews)7000 N Broadway #1-106Best for Mini-split sizing and installation    Rank06

    Why we picked them

    Controlling Systems has the longest tenure on this list, operating from the same address since 1976, and holds a 4.9 rating from 640 reviews.

    What we like

    • Fifty years at the same North Broadway location since 1976
    • NATE-certified technicians
    • Helps customers apply for Colorado efficiency rebates

    Things to consider

    • License LIC235711 is published without a stated issuing authority

    Services

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

    Key details

    Best for
    Mini-split sizing and installation
    Service area
    Denver
    Years in business
    50 years
    Warranty
    100% satisfaction guarantee stated; specific terms not detailed
    Emergency service
    Available
    Financing
    Available
    Credentials
    NATE Certification

  7. Mighty Plumbing Heating Air and Electric

    Best for a full slate of Colorado mechanical and trade licenses4.7(4786 Google reviews)4730 Paris St #100Best for Same-day furnace and AC service across a wide metro footprint    Rank07

    Why we picked them

    Mighty carries a 4.7 rating from 4,781 reviews and publishes the fullest set of Colorado contractor licenses of any company on this list, including a master mechanical registration.

    What we like

    • Holds a master mechanical registration alongside plumbing and electrical licenses
    • Service area reaches Fort Collins and Colorado Springs
    • Partnerships with Lennox, Goodman, and Navien

    Things to consider

    • Founded in 2020, less tenure than several competitors here

    Services

    • Drain cleaning
    • Water heater repair
    • Sewer line repair
    • Fixture installation
    • AC repair
    • AC installation
    • Furnace repair
    • Heat pump installation
    • Duct cleaning

    Key details

    Best for
    Same-day furnace and AC service across a wide metro footprint
    Service area
    Denver
    Years in business
    6 years
    Financing
    Available
    Credentials
    Plumbing Contractor License

  8. Applewood Plumbing Heating & Electric

    Best for review volume and background-checked technicians4.8(17782 Google reviews)5000 W 29th AveBest for Background-checked technicians for furnace and AC work    Rank08

    Why we picked them

    Applewood's 17,774 reviews at a 4.8 average is the largest review base of any company in this ranking, built over more than 50 years in the same Highland-area location.

    What we like

    • Over 17,000 Google reviews at a 4.8 average
    • More than 50 years on West 29th Avenue near Highland
    • No overtime charges regardless of arrival time

    Things to consider

    • Hours run 6 a.m. to 10 p.m. rather than a strict 24-hour schedule

    Services

    • Drain cleaning
    • Water heater repair
    • Leak detection
    • Fixture installation
    • AC repair
    • AC installation
    • Furnace repair
    • Heat pump installation

    Key details

    Best for
    Background-checked technicians for furnace and AC work
    Service area
    Denver
    Years in business
    53 years
    Financing
    Available
    Credentials
    Electrical Contractor License

  9. Roots Heating & Air

    Best for a perfect Google rating and 0% financing5.0(314 Google reviews)840 Santa Fe DrBest for 0% interest financing on new AC and furnace systems    Rank09

    Why we picked them

    Roots is the only company on this list with a perfect 5.0 rating, backed by a 2024 Best Of Denver award and reviewers who know owner Kelly by name.

    What we like

    • Perfect 5.0 rating across 314 reviews
    • Won Westword's 2024 Best Of Denver award
    • 0% interest financing as low as $60 a month

    Things to consider

    • No plumbing or electrical services for homeowners who want one contractor for everything

    Services

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

    Key details

    Best for
    0% interest financing on new AC and furnace systems
    Service area
    Denver
    Emergency service
    Available
    Financing
    Available
    Credentials
    2024 Best Of Denver, HVAC

  10. Denver's Best Heating & AC Repair

    Best for transparent flat-rate diagnostics and new refrigerants4.6(149 Google reviews)8821 E Hampden Ave #259Best for Upfront flat-rate diagnostic pricing    Rank10

    Why we picked them

    Denver's Best holds a 4.6 rating from 149 reviews and stands out for being explicitly ready for the refrigerants replacing older formulations industry-wide.

    What we like

    • NATE and EPA Section 608 certified technicians
    • Equipped for newer R-454B and R-32 refrigerants ahead of the phase-out
    • Flat $79.95 diagnostic fee waived on approved repairs

    Things to consider

    • Smallest review count in this ranking at 149

    Services

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

    Key details

    Best for
    Upfront flat-rate diagnostic pricing
    Service area
    Denver
    Years in business
    11 years
    Emergency service
    Available
    Financing
    Available
    Credentials
    NATE Certification

Compare the top hvac companies in Denver

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
01Golden West Plumbing, Heating, Air Conditioning, and Electrical24/7 emergency heating and cooling repairEmergency plumbing, Drain cleaning, Water heater repairDenver4.8 (3809)YesView →
02Ultimate Heating, Cooling, Plumbing & ElectricFlat-rate furnace and AC replacementAC repair, AC installation, Furnace repairDenver4.8 (1244)YesView →
03Heart Heating, Cooling, Plumbing & ElectricSame-visit heating, cooling, and drain workEmergency plumbing, Drain cleaning, Water heater repairDenver4.8 (3281)YesView →
04Right Away HeatingFurnace and boiler repair with same-day dispatchAC repair, Furnace repair, Heat pump installationDenver4.9 (339)YesView →
05Absolute Plumbing, Electrical, Heating & AirWhole-home systems: furnace, generator, and EV charging in one visitAC repair, AC installation, Furnace repairDenver4.8 (3969)YesView →
06Controlling Systems Heating, AC, and Electrical RepairMini-split sizing and installationAC repair, Furnace repair, Heat pump installationDenver4.9 (640)YesView →
07Mighty Plumbing Heating Air and ElectricSame-day furnace and AC service across a wide metro footprintDrain cleaning, Water heater repair, Sewer line repairDenver4.7 (4786)Not listedView →
08Applewood Plumbing Heating & ElectricBackground-checked technicians for furnace and AC workDrain cleaning, Water heater repair, Leak detectionDenver4.8 (17782)Not listedView →
09Roots Heating & Air0% interest financing on new AC and furnace systemsAC repair, AC installation, Furnace repairDenver5.0 (314)YesView →
10Denver's Best Heating & AC RepairUpfront flat-rate diagnostic pricingAC repair, AC installation, Furnace repairDenver4.6 (149)YesView →

HVAC companies serving Denver and nearby areas

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

  • Denver
Denver, Colorado

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

How we chose the best hvac companies in Denver

Read our full ranking methodology →

Every company on this list was found through two Google Maps searches, "HVAC contractor in Denver, Colorado" and "HVAC company Denver," merged in Google's own ranking order and deduplicated by place ID. Each finalist has a Google rating of 4.5 or higher from at least 50 reviews, an operational status, a real address inside Denver proper rather than a neighboring suburb, and a working website tied to the business rather than a third-party lead generator. Google place details, business websites, and Google reviews were checked on September 22, 2026. No company paid for placement or review on this list, and position reflects Google's own search order rather than a paid or sponsored slot.

How to choose a hvac company in Denver

  • 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 Denver

HVAC guides for Denver homeowners

HVAC companies in Denver FAQs

  • How do I check whether a Denver HVAC contractor is properly licensed?

    Colorado does not issue one statewide HVAC license. Plumbing and electrical work on an HVAC job is licensed through the Colorado Department of Regulatory Agencies, which issues the PC, MP, EC, and ME contractor numbers several companies on this list publish, while mechanical or HVAC-specific work is generally covered by local permitting. Ask any contractor which license or registration applies to the work being quoted and confirm it is current before signing anything.

  • How much does furnace or AC maintenance cost in Denver?

    Most companies on this list offer maintenance memberships rather than one-off tune-ups, ranging from around $149 a year for a basic seasonal plan to broader membership plans that bundle both a furnace and an AC visit. A handful of companies, including Denver's Best, charge a flat diagnostic fee, commonly under $80, that is waived if the customer approves the recommended repair. Ask for the specific membership terms and what each visit covers before signing up.

  • Why does Denver's altitude and climate matter for HVAC sizing?

    At 5,280 feet, Denver's thinner air changes how furnaces and air conditioners perform compared to sea-level cities, and the metro's wide daily temperature swings mean equipment sized for a mild coastal climate can be over or undersized here. Several companies on this list specifically mention room-by-room load calculations, especially for mini-split and heat pump installations, rather than a flat per-square-foot estimate, which is the more accurate approach at this altitude.

About this ranking

Originally published
September 2026
Last reviewed
September 2026
Companies evaluated
10

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