How to Hire an AC Contractor in Miami-Dade: A Homeowner's Guide

In Miami-Dade, air conditioning is not a luxury. It keeps your home livable for most of the year, controls humidity that can lead to mold, and protects everything inside. When it breaks in August, it is tempting to hire whoever can come first. A little preparation helps you make a good decision quickly, whether you need a repair today or are planning a full replacement.

This guide explains what to check, what to ask, and what the rules are, in plain language. When you are ready, you can browse licensed AC and HVAC contractors in this directory.

Quick note: This guide is general information, not legal or technical advice. Laws, codes, and equipment rules change, so confirm anything important with the official sources linked below, your building department, or a qualified professional.

Understand the AC contractor license

Air conditioning contractors in Florida are licensed by the state through the Department of Business and Professional Regulation (DBPR). The license tells you what kind of work a contractor is allowed to do, so it is worth understanding the classes.

License class	What it allows
Class A	Installation, repair, and service of air conditioning and heating systems of any size.
Class B	The same kinds of work, limited to systems of up to 25 tons of cooling and 500,000 Btu of heating in any one system. That covers typical homes.
Class C	Servicing existing air conditioning, heating, and refrigeration systems only. A Class C contractor is not licensed to install a new system.

Licenses are also either certified or registered. A certified license is valid anywhere in Florida, while a registered contractor may work only in the local areas where they have also met local requirements. Every contractor in this directory holds a certified AC contractor license (Class A or Class B), and those license numbers start with CAC.

Some companies that do AC work hold a mechanical contractor license instead, which is a broader state license that also covers air conditioning. Whatever the license, check that it covers the work you need.

How to check an AC license yourself

1. Ask for the license number. Florida law requires it on bids, proposals, contracts, and advertising.
2. Search by that number in the official DBPR license search. The number is more reliable than the business name.
3. Confirm the status is current and active, the license class fits your job, and the name matches the company you are talking to.
4. Review the expiration date and any complaints or disciplinary history.

A business tax receipt or corporate registration is not a contractor's license. Every listing in this directory shows the license number and the date we last checked it against DBPR records. Our page on how we verify licenses explains what our License Verified badge does and does not mean.

Technician certifications

The technicians who handle refrigerant must hold an EPA Section 608 certification under federal law. It is fine to ask whether the technician coming to your home is certified. Many technicians also hold manufacturer training or industry certifications, which can be a plus but are not a substitute for the company's state license.

Check insurance

Florida requires licensed contractors to carry general liability and property damage insurance and to have workers' compensation coverage as required by state law.

• General liability insurance helps cover damage to your home, such as a water leak from a disconnected drain line or damage to your ceiling during an attic installation.
• Workers' compensation covers injured workers. In Florida's construction industry, a business with even one employee must carry it. Up to three corporate officers may exempt themselves, but the exemption does not cover the other workers.

Ask for a certificate of insurance sent to you directly by the contractor's insurance agent. You can also look up workers' compensation coverage and exemptions through the Florida Division of Workers' Compensation. Attic work in South Florida heat is hard and risky, so this matters.

Repair or replace?

There is no single rule, but these questions help:

• How old is the system, and how often has it needed repairs? Frequent repairs on an older system may cost more over a few years than a replacement.
• What exactly failed? A capacitor, a contactor, or a clogged drain line is usually a modest repair. A failed compressor or a leaking evaporator coil on an older system is often the point where replacement makes sense.
• Is it low on refrigerant? Air conditioners do not use up refrigerant. If a system needs refrigerant again and again, it has a leak. Ask the contractor to find and quote the leak repair instead of repeatedly recharging it.
• What refrigerant does it use? New central AC systems now generally use newer refrigerants such as R-454B or R-32, which are not drop-in replacements for older R-410A equipment. Ask how this affects the choice between repairing an older system and replacing it, and about the availability and cost of refrigerant for future repairs.

Ask for a written diagnosis that explains what is wrong and what each option costs. For a major recommendation, especially a full replacement, getting a second opinion is reasonable.

Getting the size right

Bigger is not better. An oversized system cools the air quickly and shuts off before it removes enough humidity, which can leave your home cool but clammy. It also turns on and off more often, which can shorten its life. An undersized system runs constantly and may not keep up on the hottest days.

The right size depends on your home: its square footage, insulation, windows, sun exposure, ductwork, and how many people live there. Professionals calculate this with a load calculation, often called a Manual J. Florida law states that replacement AC systems in homes should be installed using quality procedures that include an equipment sizing analysis and a duct inspection.

Ask every contractor how they determined the size they are recommending. Be cautious of a quote that simply matches the size of your old unit without any measurement, because the old unit may never have been the right size, and your home may have changed since then.

Ductwork, humidity, and indoor air

• Ductwork. Leaky, crushed, or poorly sized ducts waste cooling and money. Before you replace the equipment, ask whether the contractor inspected the ducts and what they found. Sometimes duct repairs make a bigger difference than a new unit.
• Humidity. In Miami-Dade, comfort is as much about humidity as temperature. Ask how the proposed system and its settings will handle moisture. Some systems run at variable speeds, which can remove more humidity.
• Drain lines. The condensate drain line carries away the water your AC pulls out of the air. In our humid climate, clogged drain lines are one of the most common causes of water damage and service calls. Ask about a safety switch that shuts the system off if the drain backs up, and how to keep the line clear.
• Filtration and air quality add-ons. Better filters can help, but be cautious of expensive add-ons sold with health claims. Ask what each one does and whether it fits your system.

Efficiency ratings and federal rules

Air conditioners are rated for efficiency with SEER2. A higher number means less electricity for the same cooling. Heat pumps also have an HSPF2 rating, which measures heating efficiency in the same way. Florida is in the Southeast region under U.S. Department of Energy standards, and the minimum depends on the type of equipment:

Equipment type	Federal minimum
Split-system central air conditioner (separate outdoor and indoor units), under 45,000 Btu per hour (about 3.75 tons)	14.3 SEER2
Split-system central air conditioner, 45,000 Btu per hour or more	13.8 SEER2
Split-system heat pump	14.3 SEER2 and 7.5 HSPF2
Single-package air conditioner (everything in one outdoor cabinet)	13.4 SEER2
Single-package heat pump	13.4 SEER2 and 6.7 HSPF2

So the 14.3 and 13.8 SEER2 figures you may hear about apply to split-system central air conditioners. In the Southeast, those split-system air conditioner minimums are based on the date of installation, so a contractor should not install one here that does not meet them. Packaged systems and heat pumps have their own national standards, which apply to equipment manufactured since January 1, 2023. Window and other room air conditioners are covered by separate rules. Whatever you are buying, ask the contractor to show you the rating for the exact equipment combination in your quote.

These are minimums. A higher-efficiency system costs more up front and saves on electricity over time. Ask each contractor to show you the efficiency rating and the expected difference in operating cost. Make sure the outdoor and indoor units are a matched, rated combination.

About incentives in 2026. The federal Energy Efficient Home Improvement Credit (Section 25C), which many homeowners used for efficient central air conditioners and heat pumps, is not available for equipment placed in service after December 31, 2025. Be cautious of any quote or sales pitch that still counts that credit toward your cost. Your electric utility (FPL serves most of Miami-Dade) may offer its own programs from time to time, so check its website or call before you buy, and ask the contractor to put any rebate they promise in writing, including who applies for it and when it is paid.

Permits and inspections

In Miami-Dade, replacing an AC system requires a mechanical permit, and so do many other changes to equipment or ductwork. Some repairs by a licensed contractor are exempt from permits in unincorporated Miami-Dade, such as duct repairs and replacing a compressor or coil inside the existing equipment, and cities keep their own lists. A newer Florida law that exempts some small projects under $7,500 from permits does not apply to mechanical, electrical, plumbing, or gas work.

• Where to apply. In unincorporated Miami-Dade, the county building department issues permits. Inside a city such as Miami, Hialeah, Doral, or Miami Beach, the city's building department handles it.
• Who pulls it. The licensed contractor should obtain the permit in their own name. Under Florida law, a contractor may not apply for a permit without a contract to do the work. Be wary of a contractor who suggests skipping the permit or asks you to pull it.
• Inspection. The building department inspects the installation. Ask for a copy of the final inspection result, and do not make the final payment until it passes.
• Electrical work. A new system sometimes needs electrical upgrades, such as a new disconnect or circuit. Ask whether that is included and who will do and permit it.

About the Notice of Commencement

A Notice of Commencement is a short form you sign as the owner. It is recorded in the public records with the Miami-Dade Clerk of the Court and posted at the job site, and it tells subcontractors and suppliers who the owner and the contractor are and where the work is happening. Here is how the Florida rules fit together:

• Jobs of $2,500 or less. Florida's construction lien law exempts an improvement with a direct contract price of $2,500 or less from most of its rules, including the Notice of Commencement. The exemption is not complete. A contractor, laborer, or supplier who contracts directly with you can still record a claim of lien for money owed to them under that contract. So even on a small job, pay according to the contract and keep your receipts.
• Jobs over $2,500. For these jobs, the full lien law applies, and the law calls for the owner to record and post a Notice of Commencement before work begins. Subcontractors and suppliers who were hired by your contractor, not by you, can also claim liens if they follow the law's notice rules.
• The permit rule starts at $5,000. For a permitted job where the contract is more than $5,000, the building department requires a copy of the recorded notice before the first inspection, and it will not approve later inspections until the notice is on file.
• The AC exception. The building department's Notice of Commencement requirements, including the $5,000 rule above, do not apply to a contract to repair or replace an existing heating or air conditioning system for less than $15,000. So for many AC replacements, the building department will not ask you for the notice. The exception covers only the repair or replacement of an existing system. A job of $15,000 or more does not qualify.

That exception is narrower than it sounds. It changes what the building department asks of you, not your lien risk. It also does not by itself remove the separate rule in Florida's lien law (section 713.13) that calls for the owner to record and post a Notice of Commencement before work begins on a job over $2,500. In other words, the building department not asking for the notice is not the same as the law saying you do not need one. The construction lien law still applies to an AC job over $2,500, so an equipment supplier or subcontractor that your contractor does not pay may still be able to claim a lien on your home, even if you paid your contractor in full. That is why the final payment and lien release steps under Contracts and payments below matter just as much for an AC replacement as for any other project. If you want a Notice of Commencement for an AC job, or are not sure whether you need one, ask your contractor or an attorney.

If your project is $15,000 or more, or includes other work such as major ductwork or remodeling, ask your contractor and building department whether a notice is required. A notice becomes void if work does not begin within 90 days of recording, so time it with your actual start date. Keep in mind that recording a Notice of Commencement does not stop anyone from filing a lien and does not show that anyone has been paid. It puts the job on the public record and sets the timing rules that let you protect yourself by paying the right way.

Estimates and what to compare

For a replacement, try to get two or three written, itemized estimates. Each should include:

• The equipment: brand, model numbers for both the indoor and outdoor units, size in tons, and SEER2 rating.
• The load calculation or how the size was chosen.
• What else is included: new refrigerant lines or reusing the old ones, a new air handler or coil, drain line and safety switch, thermostat, electrical disconnect, duct repairs, and the equipment pad or stand.
• Permit, inspection, removal and disposal of the old equipment, and any crane or roof access costs.
• Warranties: the manufacturer's parts warranty (and whether you must register the equipment to get the full term) and the contractor's labor warranty.
• Timeline and payment schedule.

Example: One quote for a 3-ton system is $1,200 lower than another. The lower quote reuses the old refrigerant lines and air handler, while the higher one replaces them and includes a drain safety switch. Reusing parts can be fine in some cases, but you should know it is happening and why, because mismatched or old components can affect efficiency and warranty coverage.

Contracts and payments

Put everything in writing before work starts. The contract should list the equipment and model numbers, the full scope, permit responsibility, start date, warranty terms, and payment schedule.

• Recovery Fund notice. For residential contracts over $2,500, Florida law requires a written notice about the Florida Homeowners' Construction Recovery Fund, which may repay part of a loss caused by certain violations by a licensed contractor. For contracts signed on or after July 1, 2024, it can pay up to $30,000 per claim for work by trade contractors such as AC contractors, once you have a court judgment, arbitration award, or state restitution order and meet the other conditions.
• Deposits. If you pay more than 10 percent up front, Florida law requires the contractor to apply for permits within 30 days and start work within 90 days after the permits are issued, unless there is a good reason or you agreed in writing to a longer period.
• Paying. Pay the company, not an individual. Avoid cash. Tie payments to work completed, and hold the final payment until the inspection passes and you have the paperwork described below.

Final payment and lien protection

Florida's construction lien law lets subcontractors, suppliers, and in some cases workers who improve your home claim a lien on it if they are not paid, even if you have already paid your contractor. For an AC job, the supplier could be the distributor that sold your contractor the equipment. A lien can make it hard to sell or refinance until it is resolved, and in the worst case you could end up paying twice. A few habits protect you:

• Keep every Notice to Owner. A subcontractor or supplier who does not work directly for you generally must send you a Notice to Owner, no later than 45 days after they start furnishing labor or materials for your job, to keep their lien rights. Each one tells you who else expects to be paid from your project.
• Ask for lien releases as you pay. With each progress payment, ask for a partial release of lien, covering work through that date, from your contractor and from each subcontractor or supplier who sent you a Notice to Owner. Florida law provides standard forms for partial and final releases. A release can be conditioned on a check clearing, so confirm that the payment actually cleared.
• Get the contractor's final payment affidavit before the last payment. Florida law requires your contractor to give you a signed final payment affidavit stating that everyone who sent you a Notice to Owner has been paid in full, or listing each one who has not been paid and the amount still owed. The law says the final payment should be held until you receive it, and a contractor cannot sue to enforce its own lien without first providing it. If the affidavit is accurate and lists everyone who sent you a notice, you may rely on it when you make the final payment. If it lists unpaid bills, talk to your contractor, and consider legal advice, before you pay the balance.
• Collect final releases. With the final payment, ask for a final release of lien from your contractor and from each subcontractor or supplier who sent you a Notice to Owner.

Passing the final inspection is not proof of payment. The building department's inspection checks that the installation meets code. It does not check whether your contractor paid the equipment supplier, the crew, or any subcontractor. Hold the final payment until you have both the passed inspection and the paperwork above.

Subcontractors and suppliers generally have up to 90 days after they last furnished labor or materials to record a claim of lien, so keep your affidavit and releases with your project records.

Emergency service: what to ask

Many companies advertise emergency service, but the term means different things. Some answer calls around the clock, some offer extended hours, and some only schedule you for the next available day. When you call, ask:

• When can a technician actually arrive?
• Is there an emergency, after-hours, or weekend fee, and how much is it?
• What is the diagnostic or service-call fee, and is it credited toward the repair?

An emergency is also when pressure tactics are most common. It is fine to approve a repair that gets you cooling again and take a day to get a second opinion on a full replacement.

Warning signs to watch for

Be cautious if a contractor:

• Cannot give a Florida license number, or the license is a Class C (service only) but they are offering to install a new system.
• Quotes a replacement by phone without visiting, or sizes the system without any measurement.
• Recommends repeated refrigerant recharges instead of finding the leak.
• Pressures you to replace the system immediately, especially after a basic diagnostic.
• Asks for cash, or a large deposit before any permit is applied for.
• Suggests skipping the permit or asks you to pull it.
• Will not put equipment model numbers and warranty terms in writing.

In Florida, a contractor without a license cannot enforce the contract against you, and contracting without a license during a declared state of emergency is a felony. Checking the license first is still far better than dealing with a problem later.

Where to report a problem

• Unlicensed contracting: DBPR's Unlicensed Activity hotline, 1-866-532-1440, or online through DBPR.
• Contractor or permit problems in Miami-Dade: Miami-Dade County Contractor Licensing, 786-315-2880, or your city's building department.
• Price gouging after a declared emergency: the Florida Attorney General's hotline, 1-866-9-NO-SCAM (1-866-966-7226).

Condos, townhomes, and HOAs

AC work in a condo often involves rules a house does not. Equipment may sit on a shared roof or in a mechanical closet, and the association may limit where equipment can go, which models are allowed, how noisy it can be, and when crews can work. Check your association rules first, and ask contractors whether they have worked in your type of building, how they will access the equipment, and whether they can provide an insurance certificate naming the association.

Hurricane season tips

• Ask your contractor how the outdoor unit is secured to its pad or stand. Units in exposed locations should be anchored.
• If your home floods or the outdoor unit is submerged, do not turn the system back on until a licensed contractor has checked it.
• If you plan to power your AC from a generator, ask an electrician about sizing and a safe, permitted connection. Our sister guide on hiring an electrician in Miami-Dade explains generators and transfer switches.

Maintenance that pays off

• Change or clean filters regularly, more often if you have pets or ongoing work in the home.
• Keep the outdoor unit clear of plants and debris.
• Keep the condensate drain line clear, and ask your technician to check it on every visit.
• Consider a yearly professional checkup. If a company offers a maintenance plan, ask exactly what each visit includes, whether it adds priority scheduling or repair discounts, and whether it auto-renews.

Keep your records

After an installation or major repair, keep the contract, permit and inspection records, the contractor's final payment affidavit and any lien releases, invoice, equipment model and serial numbers, warranty documents (including proof of registration), and the maintenance instructions. These help with warranty claims, future service, insurance questions, and selling your home.

How this directory can help

Every AC and HVAC contractor listed here is matched to a Florida DBPR license record, and each listing shows the license number, license class, and the date the information was last verified. Listings are not paid placements, recommendations, or guarantees of work quality, and we do not verify insurance, so always ask for it yourself.

• Browse licensed AC and HVAC contractors
• Find contractors by area, such as Central Miami-Dade
• Learn how we verify licenses

Your quick checklist

• Confirm the license and its class in the DBPR license search.
• Get proof of general liability and workers' compensation insurance.
• Ask how the system size was determined, and expect a load calculation for a replacement.
• Compare itemized estimates with model numbers, SEER2 ratings, and warranty terms.
• Make sure the contractor pulls the mechanical permit, and hold the final payment until the inspection passes.
• Keep deposits reasonable, pay the company rather than an individual, and avoid cash.
• Get the contractor's final payment affidavit and lien releases before the final payment.
• Register the new equipment for warranty, and keep every document.

Official sources

• DBPR license search
• Florida Statutes, Chapter 489: Contracting
• Florida Statutes, Chapter 713: Construction liens
• U.S. Department of Energy: 2023 central air conditioner standards FAQ
• IRS: Energy Efficient Home Improvement Credit
• Miami-Dade County: What to know when hiring contractors
• Miami-Dade County: Permit exemptions
• Florida Division of Workers' Compensation