How to Start an HVAC Business in Delaware (2026)

Last updated: May 4, 2026

Starting an HVAC business in Delaware requires a state-issued Master HVACR license from the Board of Plumbing, Heating, Ventilation, Air Conditioning and Refrigeration Examiners, which operates under the Delaware Division of Professional Regulation (DPR). The board issues two license types: the full-scope Master HVACR and the limited Master HVACR Restricted. All applications go through the DELPROS online portal. The application fee is $173. Delaware has no general sales tax, which means HVAC services are not subject to sales tax – a meaningful operational difference from neighboring Maryland and Pennsylvania.

Delaware’s three-county structure concentrates most HVAC demand in New Castle County (Wilmington and Newark) and creates a distinct seasonal demand pattern in Sussex County’s beach communities. Rehoboth Beach, Bethany Beach, and Lewes see compressed summer replacement and repair volume as vacation homeowners and seasonal residents discover equipment problems during the hot months. Dover Air Force Base and the state government complex in Kent County provide a more consistent year-round commercial maintenance base. Understanding the geographic distribution of work is as important as understanding the licensing path.

Delaware HVAC License Requirements at a Glance

Requirement	Detail	Cost / Agency
Master HVACR License	Required to operate an HVAC contracting business in Delaware	$173 application via DELPROS
Master HVACR Restricted	Limited to one specialty (Forced Air Heating, Hydronic Heating, Commercial Hoods, Refrigeration, Air Conditioning, or Gas Piping)	$173 application via DELPROS
Temporary HVACR Permit	Available while full application is processed	$40 via DELPROS
Experience (Exam Path)	Journeyman certificate + 2 years supervised experience, OR 7 years supervised (Apprenticeship By-Pass Exam)	No fee; provide verification forms or tax documents
CFC Certification	Required for Refrigeration or Air Conditioning specialties; also satisfies EPA 608	Varies by certifying body
Exam Score	Minimum 70% passing score required	Exam fee varies
License Renewal	Biennial; expires December 31 of even years	Renewal fee via DELPROS; no CE currently required
Delaware Business License	Required for all Delaware businesses; separate from trade license	$75/year at onestop.delaware.gov
LLC Formation	Certificate of Formation, Division of Corporations	$110 + $300/year franchise tax
Workers’ Compensation	Required at 1+ employee; no state fund	Private carrier; purchase before first hire

How to Start an HVAC Business in Delaware (Step by Step)

Step 1: Understand the Two Delaware HVAC License Types

The Board of Plumbing, Heating, Ventilation, Air Conditioning and Refrigeration Examiners issues two HVAC contractor licenses through DPR:

Master HVACR

The full-scope Master HVACR license authorizes the holder to design, install, construct, maintain, service, repair, alter, or modify heating, air conditioning, refrigeration, ventilation, and gas piping systems without restriction on specialty. This is the license most independent contractors and business owners need. If you plan to offer full-service HVAC across residential and light commercial work, pursue the Master HVACR.

Master HVACR Restricted

The Restricted license limits the holder to a single specialty. Choices are: Forced Air Heating/Ventilation, Hydronic Heating Systems, Commercial Hood Systems, Refrigeration, Air Conditioning, or Gas Piping. Technicians who specialize exclusively in, for example, commercial refrigeration or gas piping can obtain a Restricted license with potentially less breadth of experience documentation required. The application fee is the same: $173.

Step 2: Satisfy the Experience Requirement

Delaware offers two paths to sit for the Master HVACR exam:

Path 1 – Journeyman + Experience: Hold a Journeyman certificate (from Delaware or another jurisdiction) and document at least 2 years of supervised HVAC work experience after receiving the journeyman certification. Submit experience verification through supervisor forms or tax documents showing HVAC employment during that period. This is the most common path for experienced technicians transitioning to running their own business.

Path 2 – Apprenticeship By-Pass Exam: If you do not hold a Journeyman certificate, you must document at least 7 years of supervised HVAC work experience. This qualifies you for the Apprenticeship By-Pass Exam, which tests broad HVAC knowledge to compensate for the absence of a formal journeyman certification. Document all 7 years with the same verification methods (supervisor forms or tax records).

All experience verification and work history must accompany the DELPROS application. Delaware allows up to six months to complete an application after starting it; gather documentation before you begin the online process.

Step 3: Pass the Delaware HVACR Exam

The Board requires a minimum 70% score on the licensing exam. Delaware uses a standardized exam aligned with HVAC industry knowledge standards. If you are applying by reciprocity from Connecticut or Maryland, you may not need to take an additional exam – the Board grants those states full reciprocity without requiring documentation of post-licensure experience. Applicants from most other states need 7 years of post-licensure experience to qualify for reciprocity; the Board evaluates applicants from unlisted jurisdictions case-by-case.

CFC certification (which aligns with EPA 608) is required if your license includes Refrigeration or Air Conditioning specialties. Obtain CFC certification through any recognized certifying body and have the card available for your DELPROS submission.

Step 4: Submit Your Application Through DELPROS

All Delaware DPR applications submit through the DELPROS portal. The Master HVACR application fee is $173. After submitting, the Board processes applications at its regular meeting schedule – expect several weeks to a few months depending on application completeness and meeting timing. If you need to begin work before full license processing, apply for a Temporary HVACR Permit ($40) through DELPROS while your application is under review.

Contact the Board through DPR: phone (302) 744-4500, email customerservice.dpr@delaware.gov. The Board of Plumbing, HVAC and Refrigeration Examiners reviews complete applications and sets experience requirements through its meeting schedule.

Step 5: Form Your Business Entity and Get Your Business License

File an LLC Certificate of Formation with the Delaware Division of Corporations at corp.delaware.gov for $110. Pay the flat $300 LLC franchise tax annually by June 1 – no annual report is required. Maintain a Delaware registered agent with a physical state address ($49-$300/year commercially).

Separately from your LLC, every Delaware business must obtain a Business License from the Division of Revenue for $75/year at onestop.delaware.gov. Apply before beginning operations – a temporary license prints immediately. Renew by December 31 each year. If you use a trade name different from your LLC’s legal name, register a DBA at onestop.delaware.gov for $25 (a statewide process since February 2, 2026).

Step 6: Get Your Federal EIN and Set Up Tax Accounts

Apply for a free Federal EIN at irs.gov – required for business banking, payroll, and tax filings. Delaware’s no sales tax environment means HVAC service calls, installations, and labor charges are not subject to state sales tax. This is a notable difference from Maryland (where HVAC services can trigger sales tax compliance questions) and Pennsylvania. However, Delaware’s Gross Receipts Tax (GRT) applies to HVAC service revenue at 0.3983% for general service businesses. The first $100,000 of monthly receipts is excluded for most service categories – a solo HVAC contractor doing $500,000 annually ($41,667/month) effectively owes nothing in GRT.

Delaware personal income tax applies to LLC pass-through income at graduated rates from 0% to 6.6% (top rate on income above $60,000). The corporate income tax rate is 8.7% flat if you elect S-corp or C-corp status. Register for income tax withholding if you hire employees through the Division of Revenue. If you operate in Wilmington, register for the city’s 1.25% wage tax on earnings inside city limits.

Step 7: Handle Payroll Compliance

Delaware’s Healthy Delaware Families Act PFML program applies to employers with 10 or more covered employees. The contribution rate is 0.8% of wages – employer pays at least half (0.4%), employees may be charged up to the other half. If you have 10 or more technicians on payroll, budget this cost from day one. Benefits became available to employees on January 1, 2026.

Unemployment insurance: new employers pay 1.0% on the first $14,500 of each employee’s wages in 2026 (wage base rises to $16,500 in 2027). Register before hiring at ui.delawareworks.com. Workers’ compensation is required at one employee. Delaware has no state WC fund – purchase from a licensed private carrier. An HVAC technician falls under NCCI code 5183 for workers’ comp classification, typically running 4-8% of payroll depending on loss history. Delaware’s minimum wage is $15.00 per hour. Report new hires within 20 days of the start date.

Step 8: Pull Building Permits and Understand County Requirements

Delaware HVAC installation and replacement work requires building permits in most jurisdictions. The state does not have a single unified permitting authority – permits are administered at the county or municipal level. New Castle County handles most permit activity in the Wilmington metro. The county’s Department of Land Use issues mechanical permits for HVAC work. Newark (University of Delaware’s home city) processes permits through its own building department. Kent County administers permits through the county’s Public Works department. Dover has its own city building office.

Sussex County permit requirements affect contractors serving the beach communities heavily. Rehoboth Beach, Bethany Beach, Ocean View, Fenwick Island, and Lewes each have their own building offices. Summer season compressed timelines mean contractors bidding beach replacement jobs often need fast permit turnaround. Build extra lead time into beach-area estimates. Lewes permits flow through the city; county areas outside incorporated municipalities go through Sussex County’s Community Development and Planning office.

Federal Refrigerant Transition: A2L Requirements

The federal AIM Act (American Innovation and Manufacturing Act) requires the phasedown of high-GWP refrigerants including R-410A. New HVAC equipment shipped after January 1, 2025 must use lower-GWP alternatives, primarily R-32 and R-454B (collectively called A2L refrigerants for their mildly flammable classification). Technicians installing A2L-compatible systems need updated training on safe handling procedures for mildly flammable refrigerants – the handling requirements differ from R-410A. R-410A equipment can still be installed from existing inventory through December 31, 2025. Verify equipment and refrigerant type before accepting jobs to avoid compatibility and compliance issues.

Delaware HVAC Market: Where the Demand Is

Delaware’s compact geography creates three distinct HVAC market zones. New Castle County generates the state’s largest volume of residential and commercial work. Wilmington’s aging housing stock in the city’s 30,000+ occupied residential units creates recurring replacement demand. The Newark-Glasgow-Bear corridor of newer suburban development generates a mix of replacement and new construction. AstraZeneca’s North American headquarters in Fairfax/Brandywine, Chemours’ corporate facilities, JPMorgan Chase’s large Delaware operations campus, and Bank of America’s major Wilmington presence create commercial preventive maintenance contract opportunities that sustain contractors year-round.

Sussex County’s beach economy creates a distinct seasonal demand surge. Rehoboth Beach sees its population multiply 10-20x in summer months; a 20-year-old heat pump failing in July during a beach vacation rental is an emergency call at premium pricing. Contractors who establish coverage in Sussex County must staff accordingly for June through August. The year-round retiree population expanding in communities like Ocean View, Millsboro, and Millville adds a steadier residential base that smooths income between peak seasons.

Kent County anchors a more stable demand base. Dover Air Force Base is one of the largest USAF installations on the East Coast; base housing, administrative buildings, and aircraft maintenance facilities generate both residential and commercial maintenance work. State government office buildings, Bayhealth Medical Center, and Dover’s downtown commercial district add to the commercial contract base. Kent County contractors often span into Sussex and New Castle as well, given the short drive distances in Delaware’s compact geography.

Cost to Start an HVAC Business in Delaware

Cost Item	Amount	Frequency
Master HVACR license application	$173	One-time (biennial renewal fee additional)
Temporary HVACR permit (if needed)	$40	One-time during application period
LLC Certificate of Formation	$110	One-time
Annual LLC Franchise Tax	$300	Annual (June 1)
Delaware Business License	$75	Annual (December 31)
EPA 608 / CFC Certification	$20-$150 typical	One-time (no expiration)
General Liability Insurance	$1,500-$4,000/year typical solo contractor	Annual
Workers’ Compensation (if hiring)	4-8% of payroll (NCCI code 5183)	Annual premium

Related Delaware Business Guides

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Frequently Asked Questions

Does Delaware require a state HVAC license?

Yes. Delaware requires a Master HVACR or Master HVACR Restricted license from the Board of Plumbing, Heating, Ventilation, Air Conditioning and Refrigeration Examiners, which operates under the Delaware Division of Professional Regulation. Apply through the DELPROS portal at delpros.delaware.gov. Application fee: $173. You cannot legally operate an HVAC contracting business in Delaware without this license.

What experience do I need for a Delaware Master HVACR license?

Two paths: (1) Hold a Journeyman certificate plus at least 2 years of supervised HVAC experience after receiving the journeyman certification. (2) Document at least 7 years of supervised experience without a journeyman certificate, which qualifies you for the Apprenticeship By-Pass Exam. Document experience through supervisor verification forms or tax records showing HVAC employment.

Does Delaware have HVAC reciprocity with other states?

Yes, with favorable terms for Connecticut and Maryland applicants. License holders from those two states need no additional experience documentation for Delaware reciprocity. Applicants from most other states need 7 years of post-licensure experience. Applicants from jurisdictions not listed by the Board are evaluated on a case-by-case basis. Contact the Board at (302) 744-4500 to confirm current reciprocity terms for your state.

Is HVAC work subject to sales tax in Delaware?

No. Delaware has no general state or local sales tax. HVAC service calls, installations, and labor charges are not subject to Delaware sales tax. Delaware does impose a Gross Receipts Tax (GRT) on business revenue – most HVAC contractors pay 0.3983% on receipts above $100,000/month. For most solo contractors and small shops, GRT is effectively zero.

When do Delaware HVAC licenses expire?

Delaware Master HVACR licenses expire on December 31 of even years and must be renewed biennially. A recent update to DPR Regulation 5.0 clarified continuing education requirements for the 2026 renewal, though multiple sources indicate CE is not currently required for the 2026 renewal cycle. Verify current renewal requirements at dpr.delaware.gov or by calling (302) 744-4500.

Do I need to pull building permits for HVAC work in Delaware?

Yes, for most installation and replacement work. Delaware does not have a state-level mechanical permit; permits are issued by county or municipal building departments. New Castle County’s Department of Land Use handles most of the Wilmington metro area. Kent County and Sussex County each have their own processes. Beach communities (Rehoboth Beach, Bethany Beach, Lewes) have their own permit offices. Always pull the required permit – unpermitted HVAC work creates liability for the homeowner, can void equipment warranties, and risks disciplinary action against your license.