HVAC Permits & Licenses in Louisville, KY

HVAC contractors are subject to Kentucky’s occupational tax on services, which is administered through the sales tax system. Labor charges for installation, repair, or maintenance of HVAC systems are subject to sales tax when combined with taxable parts. The tax rate is 6% state-level; local rates may apply. This is not a separate tax but part of the sales tax obligation on taxable services.

Required for all businesses; HVAC contractors must also hold state certification

Applies outside Louisville city limits; separate from Metro license

Must verify zoning district allows contractor services (C-M, C-2, etc.)

Limited to 25% of home; no outside storage of equipment/vehicles

HVAC installation work requires separate mechanical permits

Must be performed by state-licensed contractor; inspections required

Maximum size varies by zoning district

Required for shops storing refrigerants or fuels

Required for commercial buildings >5,000 sq ft

Final approval after all inspections passed

HVAC businesses categorized under construction trades

Contractor shops typically B-1, B-2, B-3, B-4 zones

Required for all domestic LLCs. Annual report required separately (see below).

Applies to all LLCs in good standing.

Renewal every 5 years for $15.

Required for HVAC contracting businesses. Must designate a supervising master HVAC contractor. Effective requirements per KRS 198B.080.

Prerequisites: 2 years practical experience OR journeyman license + 2 years experience; pass exam. Business license contingent on this.

Not directly required for business but common prerequisite for supervising master.

Applies to most HVAC businesses selling equipment/parts. File returns monthly/quarterly.

Required if payroll exceeds thresholds.

HVAC businesses in Kentucky must register for a sales tax permit if they sell or lease tangible personal property (e.g., HVAC units, thermostats) or provide taxable services. Labor-only service calls are generally not subject to sales tax, but installation or repair involving parts is taxable. Registration is done via the Kentucky Energy Tax System (KETS).

All employers in Kentucky must register for withholding tax and remit state income tax withheld from employee wages. Filing frequency (monthly, quarterly) is assigned based on liability volume.

Employers with one or more employees must register with the Kentucky Office of Unemployment Insurance. New employers pay a standard rate of 2.7% on the first $11,400 of each employee’s annual wages. Employers are liable once they pay $1,000 in wages in any calendar quarter or employ someone for part of a day in 20 different weeks.

Required for all employers with one or more employees in Kentucky, including part-time workers. Sole proprietors and partners may opt out if they own at least 20% of the business. HVAC contractors are classified under NAICS code 238220 (Other Specialty Trade Contractors), which typically falls under risk class 5018 with moderate premiums.

Not legally mandated statewide for all businesses, but strongly recommended. Often required by commercial leases, contracts, or local jurisdictions. HVAC businesses face high risk of property damage or bodily injury claims during service.

Required under Kentucky Revised Statutes (KRS) 304.20-020. Minimum liability limits: $25,000 bodily injury per person, $50,000 per accident, $25,000 property damage. Applies to all vehicles used for business, including vans or trucks transporting tools or employees.

Kentucky does not require a surety bond for general HVAC work at the state level. However, some local jurisdictions (e.g., Louisville Metro) may require a bond as part of contractor registration. Additionally, if a contractor opts to register with the Kentucky Department of Financial Institutions (DFI) for home improvement work, a $10,000 bond may be required under KRS 244.015–244.990. HVAC work involving home modifications may fall under this if combined with remodeling.

Not legally required by Kentucky state law for HVAC contractors. However, it is strongly recommended, especially for businesses offering design, energy audits, or system specifications. May be required by clients or general contractors on commercial projects.

Not mandated by Kentucky law, but critical if the business sells and installs equipment. HVAC contractors can be held liable for defective or improperly installed products under tort law. Coverage is often bundled with general liability.

Only applicable if the HVAC business hosts events where alcohol is served (e.g., grand opening with bar service). Not relevant for standard HVAC operations. Required under Kentucky ABC regulations for any entity holding a liquor license.

All LLCs with employees or that operate as a corporation or partnership must have an EIN. Single-member LLCs with no employees may use the owner's SSN, but obtaining an EIN is recommended for liability separation. HVAC businesses often need an EIN if they hire technicians.

By default, LLCs are pass-through entities. Single-member LLCs report income on Schedule C; multi-member LLCs file Form 1065. HVAC businesses must report all service and equipment sales income. Self-employment tax applies to net earnings over $400.

HVAC technicians face hazards including electrical exposure, refrigerant handling, and working at heights. Employers must provide training, safety data sheets (SDS), and personal protective equipment (PPE). Specific standards include 29 CFR 1910 Subpart S (Electrical) and 1910.132 (PPE).

Commercial properties may be subject to periodic fire safety and building code inspections. HVAC businesses with physical locations must comply with local codes. Contact local building inspection department for schedule.

HVAC businesses must keep records of refrigerant recovery, recycling, and disposal. Technicians must verify proper handling. While small appliances (<50 lbs) are exempt from recordkeeping, larger systems (e.g., commercial AC units) require logs.

HVAC businesses must inspect, document, and repair refrigerant leaks in large systems. Records must be retained for 3 years. Technicians must be EPA Section 608 certified.

All LLCs in Kentucky are subject to the Limited Liability Entity Tax (LLET), a gross receipts tax. The tax is due annually regardless of income or activity. The minimum tax is $175. The rate is tiered: $175 on first $250,000 of gross receipts, then incremental rates up to $200,000 maximum tax. Applies to all LLCs, including single-member and inactive if registered.

Kentucky requires pass-through entities (like most LLCs) to file Form 740PT to report income allocated to Kentucky resident members. While the LLC itself does not pay income tax, it must file an informational return if it has income from Kentucky sources. Members report their share on individual KY-740 returns.

Many Kentucky cities (e.g., Louisville, Lexington, Bowling Green) require a local business license or privilege tax. For example, Louisville Metro Business Tax Division requires registration and quarterly filing based on gross receipts. HVAC businesses must check with each municipality where they operate. Fees and requirements vary significantly.

Mandatory under Clean Air Act Section 608. HVAC businesses must ensure all technicians are certified by an EPA-approved organization (e.g., EPA-authorized test provider). Certification is individual, not business-wide. Required for servicing air conditioning and refrigeration equipment.

HVAC businesses must use certified technicians, recover refrigerant before opening systems, and maintain records of disposal. Prohibits intentional release of ozone-depleting refrigerants. Applies to systems containing CFCs, HCFCs, and HFCs.

HVAC businesses must pay at least federal minimum wage ($7.25/hour) and overtime (1.5x regular rate) for hours over 40/week. Independent contractor classification must meet DOL criteria to avoid misclassification penalties.

All employers, including HVAC LLCs, must complete Form I-9 for each employee to verify identity and work authorization. Employers must retain forms for 3 years after hire or 1 year after employment ends, whichever is later.

Covers eligible employees for up to 12 weeks of unpaid, job-protected leave per year for qualifying reasons. HVAC businesses with fewer than 50 employees are exempt.

HVAC companies offering in-home estimates or sales must provide consumers with a written notice of cancellation rights within 3 business days. Applies to sales over $25 made at locations other than the seller's permanent address.

HVAC businesses must ensure all advertising (online, print, TV) is truthful and not misleading. Claims about energy efficiency, pricing, or technician certification must be substantiated. Applies to all marketing, including social media and third-party platforms.

HVAC businesses with retail offices or service centers must ensure accessibility for people with disabilities, including parking, entrances, and service counters. Applies to new construction and alterations under ADA Standards for Accessible Design.

All Kentucky LLCs must file an annual report with the Secretary of State to maintain good standing. The report includes business name, principal address, registered agent, and management structure.

HVAC contractors must hold a Class A or Class B Mechanical Contractor License issued by DHBC. Renewal requires proof of current liability insurance and compliance with bonding requirements.

Under the Clean Air Act, Section 608, all technicians who maintain, service, repair, or dispose of appliances containing regulated refrigerants must be certified. Certification is obtained through an EPA-authorized program and does not expire, but employers must ensure technicians remain certified.

While the EPA does not require continuing education for Section 608 certification, many HVAC professionals pursue CE to maintain credentials like NATE, which are often required by employers or local codes.

HVAC businesses that install or service equipment may be required to collect and remit sales tax on parts and equipment. Labor for repairs may be exempt; installation of new systems may be taxable. Businesses must register with the KY DOR and file returns electronically.

LLCs with employees must file quarterly Form 941 (Employer's Quarterly Federal Tax Return) and annual Form 940 (Federal Unemployment Tax Act). Form W-2 must be issued annually to employees by January 31.

All Kentucky employers with one or more employees must carry workers’ compensation insurance. HVAC businesses with employees must maintain coverage at all times and file annual reports if self-insured.

HVAC businesses with 11 or more employees must maintain OSHA Form 300 (Log of Work-Related Injuries), Form 301 (Incident Report), and post Form 300A annually. Records must be kept for 5 years.

Required federal posters include the Minimum Wage Law, Employee Rights under the FMLA, OSHA Workplace Safety, and EEOC Notice. Kentucky-specific posters include the Kentucky Workers’ Compensation Notice and Wage Payment Law. Available at https://www.dol.gov/agencies/whd/posters and https://kentucky.gov/Pages/Activity-Page.aspx?topicId=137

Cities like Louisville and Lexington require an Occupational Tax Certificate or Business License. HVAC businesses must check with local clerk’s office for specific requirements and deadlines.

All Kentucky LLCs are subject to the Limited Liability Entity Tax (LLET) and must file Form 720 annually. The tax is $175 minimum or 0.00115 of taxable gross receipts, whichever is greater.