Should you run in-house install crews or subcontract installs?
What each model costs you to control, where callback risk lands, and the licence, permit and classification questions that decide how much of the choice is yours.
There is no universal answer: whether to subcontract HVAC installation or run in-house install crews comes down to how steady your install volume is, how much day-to-day control you need, and how your state's licence and permit rules treat subcontractors.
What the research does show clearly is this: the subcontract route carries its own legal traps — classification, licensing, permits — and they deserve answers before you sign anything.
What does each model cost per install?
Honestly: no verified figure we found prices an in-house install against a subcontracted one, so this page will not hand you a dollar number.
Per-install figures quoted in forums and on vendor blogs are not data we could verify; treat them as questions for your own books, not as benchmarks.
What can be compared precisely is the cost lines — the items that move between the two columns when an install goes from your payroll to a subcontract.
The in-house column is wage plus burden: the installer's wage or salary, payroll taxes on those wages, benefits, workers' compensation, and the trucks, tools and training the install standard requires — and the crew sits on payroll through the slow weeks as well as the busy ones.
That wage decision is its own project: how to hire an HVAC installer covers sourcing, pay benchmarks and screening for the role.
The subcontracted column swaps those line items for an invoice.
The costs underneath do not disappear; they move into the sub's rate.
A genuinely self-employed sub carries self-employment tax at 15.3% — 12.4% Social Security plus 2.9% Medicare — and can deduct the employer-equivalent half when figuring adjusted gross income (IRS), and the sub's own insurance, truck and tools sit on the sub's side of the line.
The real comparison, then, is invoice price against your own fully loaded crew cost — and since your burden line is specific to your shop, the answer lives in your numbers, not in a rule of thumb.
How do quality and callbacks compare?
Our research did not confirm any data comparing callback rates between in-house and subcontracted installs, so we will not quote one — no honest number exists on this page, and one that sounds precise elsewhere deserves suspicion.
What can be said is structural.
The things that drive install quality — training, a written install standard, supervision — can exist in either model.
What changes with a sub is who owns them.
In-house, you set the standard, train to it, supervise it, and a callback returns as payroll hours from a crew you already cost.
Subcontracted, the crew works to the sub's process, not your checklist, and the callback becomes a contract question: what your agreement says about warranty labor, response times, and who pays for the return visit.
If you subcontract, that paragraph belongs in the agreement before the first job — not negotiated after the first failure call.
Control is the hinge that connects quality to legality.
A sub runs their own schedule and their own process — that independence is what makes them a sub.
The more you direct the how and the when, the more the arrangement starts to look like employment in the eyes of the agencies that decide such things, which is the first trap in the next section.
What licence and permit issues come with subs?
The first trap is the label.
Subcontracting installs does not settle worker status: under the Fair Labor Standards Act, true independent contractors get no minimum-wage or overtime protection, and status turns on the economic realities of the relationship, not on what the invoices say (U.S. Department of Labor).
The IRS asks its own common-law questions — behavioral control, financial control and the type of relationship — and Form SS-8 asks the IRS to decide (IRS).
On the wage-law side, the Department of Labor proposed on Feb.
26, 2026 to replace its 2024 rule with a test built on two core factors — the worker's control over the work and the worker's opportunity for profit or loss; the proposal is not final as of Sept.
29, 2026, DOL is no longer applying the 2024 rule in its own investigations, and the 2024 rule remains in effect for private lawsuits.
A crew you dispatch, equip and direct day-to-day can be reclassified as employees whatever the paperwork says — the full tests are on our 1099 vs W-2 contractor page.
The second trap is the sub's own licence — in the states below, the duty follows the work and the contract, not your org chart.
In Tennessee, a state contractor licence is required to perform plumbing and HVAC work — including as a subcontractor — once a job reaches $25,000, counting materials and labor.
In Mississippi, subcontractors doing residential HVAC, plumbing, mechanical or electrical work on a residential construction or improvement project must be licensed by MSBOC, and on commercial jobs over $50,000 — equipment installation included — every contractor and subcontractor needs the MSBOC commercial licence (Certificate of Responsibility).
Beyond per-job licences, a state can also attach duties to how much a licensed shop subcontracts.
In New Jersey, a plumbing contractor who subcontracts more than one-third of its work in a year must say so in its advertising — that a substantial part of the work may be done by independent licensed subcontractors (New Jersey Division of Consumer Affairs, plumbing-board guidance).
And licence law can draw the in-house/sub line directly: New Jersey's HVACR rules — the State Board of Examiners of HVACR Contractors, Division of Consumer Affairs — say HVACR work that the master HVACR contractor has not subcontracted may be done only by the master or by W-2 employees of the business, which is why unlicensed technicians in New Jersey can work legally as W-2 employees of a licensed business.
In Kentucky, an HVAC company must keep a master HVAC contractor in responsible charge — that person may be an employee or a subcontractor, and the master must notify the Kentucky Department of Housing, Buildings and Construction when that employment starts and ends.
Permits are the third trap: "the sub pulls their own permit" is not automatic — who may pull, and who answers for the inspection, comes from licensing and permitting rules that can be state or local.
Two plumbing examples.
In Texas plumbing, the Responsible Master Plumber whose licence secures the contract is responsible for supervising all plumbing performed under it — permits, inspections, and making sure the workers doing it are licensed or registered — whether those workers are employees or subcontractors (Texas State Board of Plumbing Examiners).
In Montana, only a licensed master plumber may pull plumbing permits at all.
Which of these shapes your jobs is a question for your state licensing board and your local building department — ask both — and the subcontract should say in writing who pulls and who answers.
Rules vary by state and often by city and county.
Confirm the sub's licence class, the permit duty and any subcontracting disclosure rules with your state licensing board and the local building department before you sign — and re-check them when you expand into new territory.
Whichever way the comparison lands for your shop, the wider job of hiring HVAC and plumbing techs is its own guide.
This page is employer career and business information, not legal advice. Licensing, permitting and worker-classification rules are fact-specific and differ by state — confirm your situation with your state licensing board, your city or county building department, or an employment attorney before you subcontract installs or pay a crew on a 1099 basis.
Before you subcontract the next install
- The sub's licence verified with your state board — right class of work, current, and valid for the job value.
- Named in the written agreement: who pulls the permit, who answers the inspection, and who supplies what.
- Warranty labor settled in writing: who returns for a callback and who pays for the return visit.
- The relationship tested three ways — against the two core factors in DOL's proposed test, against the IRS's behavioral-control, financial-control and relationship questions, and against the 2024 rule that remains in effect for private lawsuits — not against the label on the form.
- Your state's subcontracting rules checked with the board: advertising disclosures and any reporting duties are state-specific.
- Insurance certificates requested and current — how insurers and states treat subcontractors was outside our research; put the question to your carrier and your state agency.
Questions employers ask
Is it cheaper to subcontract HVAC installs?
No verified per-install comparison exists in our research, so no honest number fits here — including ours.
Structurally, subcontracting swaps a wage-plus-burden line for an invoice: a genuinely self-employed sub carries self-employment tax at 15.3% — 12.4% Social Security plus 2.9% Medicare — plus their own insurance, truck and tools.
Compare invoice price against your fully loaded crew cost, job by job.
Can I pay an HVAC install crew as 1099 subcontractors?
Only if the relationship passes the tests — and the tests belong to the IRS and the Department of Labor, not to the form you file.
Under the FLSA, contractor status turns on the economic realities of the relationship, not the label; the IRS looks at behavioral control, financial control and the type of relationship.
A crew you direct day-to-day can be employees whatever the paperwork says.
Does a subcontractor need their own HVAC licence?
It depends on your state and the job's value — Tennessee and Mississippi are two states where the answer is yes.
In Tennessee, a state contractor licence is required for plumbing and HVAC work, including as a subcontractor, at $25,000 or more including materials and labor.
In Mississippi, subcontractors doing residential HVAC or plumbing work on a residential construction or improvement project must be licensed by MSBOC.
Confirm with your state board before the first job.
Who pulls the permit on a subcontracted install?
It depends on the licensing and permitting rules where you work — state or local — and it is not automatically the sub.
In Texas plumbing, the Responsible Master Plumber who secured the contract is responsible for permits, inspections and worker licensure, whether the workers are employees or subcontractors.
In Montana, only a licensed master plumber may pull plumbing permits.
Put the answer in the contract and confirm with your board and local building department.
More hiring resources
Building the in-house bench? Find the installers first.
Post the role where HVAC and plumbing techs already look — next to the guides they read.