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Plumbing/Heating & A/C Contractors in Dubuque, Iowa

21 contractors registered with the State of Iowa for this trade in Dubuque. This is the complete registry — we do not rank anyone by quality. Paid Premiere placements appear first and are labelled; everyone else is alphabetical. How this list is built →

Also searched as: plumber, plumbing, hvac, furnace, boiler, ac, a/c, air conditioning.

Premium — pays for placement, shown firstVerified — owner confirmed their details with the StateEvery registered contractor is listed either way — a badge moves a listing up, it never removes anyone, and neither is a judgement of anyone’s work.

← All contractors in Dubuque

More plumbing/heating & a/c contractors nearby in Dubuque County

  • Boge Mechanical Systems LLC

    Dyersville, IA · Dubuque County

    Plumbing/Heating & A/C Contractors

    On the State’s register since 2026

    REGISTEREDCall
  • Demmer Mechanical Corp

    Dyersville, IA · Dubuque County

    Plumbing/Heating & A/C Contractors

    On the State’s register since 2026

    REGISTEREDCall
  • Heims Plumbing & Electric INC

    Farley, IA · Dubuque County

    Plumbing/Heating & A/C Contractors

    On the State’s register since 2026

    REGISTEREDCall
  • Marv Mclees Plumbing & Heating

    Cascade, IA · Dubuque County

    Plumbing/Heating & A/C Contractors

    On the State’s register since 2026

    REGISTEREDCall
  • Mcdermott Bros. Custom Homes INC.

    Peosta, IA · Dubuque County

    Plumbing/Heating & A/C Contractors

    On the State’s register since 2026

    REGISTEREDCall
  • Mm Mechanical

    Dyersville, IA · Dubuque County

    Plumbing/Heating & A/C Contractors

    On the State’s register since 2026

    REGISTEREDCall
  • Reuter Mechanical

    Epworth, IA · Dubuque County

    Plumbing/Heating & A/C Contractors

    On the State’s register since 2026

    REGISTEREDCall
  • Wente Electric

    Farley, IA · Dubuque County

    Plumbing/Heating & A/C Contractors

    On the State’s register since 2026

    REGISTEREDCall
  • Zierden Plumbing LLC

    Sherrill, IA · Dubuque County

    Plumbing/Heating & A/C Contractors

    On the State’s register since 2026

    REGISTEREDCall
All plumbing/heating & a/c contractors in Dubuque County →

How many plumbing/heating & a/c contractors are registered in Dubuque?

As of September 2026, 21 plumbing/heating & a/c contractors based in Dubuque hold a construction contractor registration with the State of Iowa, 21 of them currently in Registered status. That is about 2% of the 1,309 plumbing/heating & a/c contractors registered statewide. This is the complete State registry for Dubuque — not a paid or curated selection.

In Dubuque
21
registered in this trade
Currently registered
21
in active status
New in 12 months
21
first registered or renewed into the register
Median tenure
0.2 yrs
on the register (not a measure of experience)

Comparing beyond city limits? All 1,309 plumbing/heating & a/c contractors registered in Iowa →

What to know before hiring plumbing/heating & a/c contractors in Dubuque

The license is the real credential

Plumbing and mechanical work is licensed by a board with an actual exam. When comparing bids, ask for the license number and confirm it with the board directly. This is the single strongest quality signal available in any Iowa construction trade — most trades have no equivalent.

Iowa’s heating season is unforgiving

A furnace failure in an Iowa January is an emergency, and emergency work costs more and offers no time to compare bids. Systems replaced on a planned timeline in spring or early autumn are quoted in a fundamentally different market than the same system replaced in a cold snap.

Frozen and burst supply lines

Sustained subzero stretches routinely burst pipes in uninsulated crawlspaces, exterior walls, and unheated outbuildings. If a plumber is repairing a freeze break, ask what change would stop it recurring — insulation, rerouting, or a shutoff — rather than only repairing the failed section.

Planning plumbing/heating & a/c contractors work in Dubuque

How to Find the Best HVAC Contractor in Iowa (2026 Guide)

Find a licensed HVAC contractor in Iowa for furnace, AC, and heat pump work. What to check, what licensing means, and how to compare bids.

Hiring · 7 min read

Sump Pump Replacement Cost in Iowa (2026 Guide)

What does sump pump replacement cost in Iowa? Learn when to replace before spring melt, cost drivers, and how to find a registered contractor.

Costs · 7 min read

How to Find the Best Plumber in Iowa for Your Project

Need a licensed plumber in Iowa? Learn how to compare state-registered professionals, verify licenses, and hire the right pro for your job.

Hiring · 6 min read

How to choose the best plumbing/heating & a/c contractors in Dubuque

Iowa does not rate or rank contractors, and neither do we — the 21 registered plumbing/heating & a/c contractors listed on this page (current as of September 2026) are the complete State registry for Dubuque, shown without any quality ranking. “Best” is not a list you can look up; it is the contractor who is right for your job. Here is the method the pros’ own trade associations recommend for finding them:

  1. 1. Start from the complete list, not an ad. Every business above holds a current State registration — a legitimacy baseline the incumbents’ pay-to-play lists cannot promise. Shortlist three or four whose location and trade fit your project.
  2. 2. Confirm the registration is active. Check each one on the Iowa Department of Inspections, Appeals, and Licensing’s official portal (verify a registration ↗). Every profile here links to the State’s own record so you can check it in one click.
  3. 3. Verify the plumbing, HVAC & mechanical license. Registration is not a skills license — but plumbing, HVAC & mechanical work in Iowa is separately licensed by the Iowa Plumbing & Mechanical Systems Board ↗, which tests competence. Ask for the license number and confirm it there. This is the single strongest quality signal available for this trade.
  4. 4. Get current proof of insurance. Ask for a certificate of general liability and workers’ compensation. Never let uninsured work start on your property.
  5. 5. Get at least three written, itemized bids. Compare the same scope apples-to-apples. Be wary of a bid far below the rest — it usually hides missing scope or “surprise” costs later.
  6. 6. Check references and recent local work, then put the full scope, price, milestone payment schedule, and warranty in a written contract before anyone starts.

The full guide: finding the best contractor in Iowa →Questions to ask before you hire →How to verify a registration →

Frequently asked questions

Are plumbers and HVAC contractors licensed in Iowa?

Yes. Plumbing, HVAC, and mechanical work are licensed in Iowa by the Iowa Plumbing and Mechanical Systems Board, which tests competence before issuing a license. This is separate from the State construction contractor registration under ch. 91C, and it is a substantially stronger signal because a genuine exam sits behind it.

How do I verify an Iowa plumbing or HVAC license?

Ask the contractor for the license number and confirm it directly with the Iowa Plumbing and Mechanical Systems Board rather than relying on a logo or a claim on a truck or website. Separately, confirm the State construction contractor registration is active and ask for current proof of liability and workers’ compensation insurance.

Who are the best registered plumbing/heating & a/c contractors in Dubuque, Iowa?

Iowa does not rate or rank contractors, so there is no official "best registered plumbing/heating & a/c contractors" list — any site claiming one is guessing. Instead, this directory shows the complete field: all 21 registered plumbing/heating & a/c contractors the State lists in Dubuque, Iowa, unranked, so you can compare them yourself. To find the best one for your project, confirm each contractor's registration is active, ask for current proof of liability insurance and workers' compensation (and, for a licensed trade, a current State trade license), and get at least three written itemized bids before you hire.

How many registered plumbing/heating & a/c contractors are there in Dubuque, Iowa?

As of September 2026, the State of Iowa lists 21 registered plumbing/heating & a/c contractors in Dubuque, Iowa. This directory shows all of them — it is the complete public registry, with no paid placement affecting who is listed.

Is a registered contractor the same as a licensed contractor?

No. Iowa requires most construction contractors to register with the State (Iowa Code ch. 91C), but registration is not a license, an endorsement, or a guarantee of quality, insurance, or bonding. It confirms only that the business filed a current registration with the State.

How do I verify a contractor's Iowa registration?

Look up the registration number on the Iowa Department of Inspections, Appeals, and Licensing's official portal (https://laborportal.iwd.iowa.gov/iwd_portal/). Every profile in this directory links to the State's own record so you can confirm it independently — see the step-by-step guide at https://contractiowa.com/verify.

Are these contractors insured or bonded?

Registration does not verify insurance or bonding. Always ask a contractor for current proof of liability insurance and workers' compensation, and get at least three written bids, before you hire.

Where does this data come from and how current is it?

It comes directly from the Iowa Department of Inspections, Appeals, and Licensing's public "Active Iowa Construction Contractor Registrations" record, last exported September 2026. You can read how this directory is built and download the underlying dataset.

Data, sources & method →Verify a registration with the State ↗