HVAC contractors in
Knoxville, Tennessee.
A public directory of hvac contractor businesses serving greater Knoxville. Market data, licensing requirements, and cost benchmarks — updated continuously from public sources.
HVAC jobs in Knoxville
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Common Job Costs
Licensing Requirements
Licensing Requirements
Tennessee requires HVAC contractors to hold a state-issued license through the Tennessee Department of Commerce and Insurance (TDCI), Board for Licensing Contractors. Two primary license types apply: the Mechanical Contractor license (D-28) covers full HVAC systems including commercial work, and the limited license (D-28 Limited) covers residential systems only. Applicants must pass the Tennessee HVAC licensing exam administered by PSI Exams, demonstrate a minimum of four years of field experience (or two years with a relevant technical degree), and provide proof of insurance and financial statements. Licenses renew every two years. Continuing education is not currently mandated at the state level for renewal, but contractors must maintain active insurance and bonding status. EPA Section 608 Certification is also required for any technician handling refrigerants — this is a federal requirement enforced separately from the state license.
Permit Requirements
All HVAC installation, replacement, and major repair work in Knoxville requires a mechanical permit through the City of Knoxville Department of Building & Neighborhood Services or Knox County Building Codes department, depending on project location. Permit fees are typically calculated based on project value. Simple equipment replacements (like-for-like) may qualify for a simplified permit process, but new system installations and ductwork modifications require full mechanical permits. Contractors must be licensed with the state and registered with the local jurisdiction to pull permits. Homeowners generally cannot pull their own mechanical permits for HVAC work in Knox County.
Inspection Schedule
After permit issuance, rough-in inspections are required before walls or ceilings are closed. A final inspection is required upon system completion before the unit is placed into service. For new construction, inspections typically occur in two stages: rough mechanical and final mechanical. Knox County and City of Knoxville inspectors are separate jurisdictions — contractors must schedule with the correct authority based on project address. Inspection scheduling is done online through the respective building department portals. Typical inspection turnaround is 1 to 3 business days after request during normal periods, longer during peak construction seasons.
Insurance Minimums
Tennessee requires HVAC contractors licensed under the Board for Licensing Contractors to carry general liability insurance with a minimum of $300,000 per occurrence for most contractor classifications. Many commercial clients and general contractors require $1,000,000 per occurrence as a practical minimum. Workers' compensation insurance is required for any contractor employing five or more workers (three or more in the construction industry, per TN law). Contractors should also carry commercial auto insurance covering any vehicles used for business. Surety bonding requirements vary by license classification — confirm current amounts with the TDCI Board for Licensing Contractors.
Compliance research unavailable
Source status: unavailable · 7/21/2026
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Local market snapshot
Source: DoorBase, aggregated public ZIP-level data. Updated 8/17/2026.
How to Get Licensed
Verify Eligibility
Confirm you meet the minimum experience requirements: four years of documented field experience in HVAC work, or two years with an accredited technical degree in a related field. Start collecting employment records, references, and any certifications you already hold. You will need these for your application.
Obtain EPA Section 608 Certification
Before you can legally handle refrigerants on any HVAC job, you must hold a valid EPA Section 608 certification. Choose your certification type based on the equipment you work on: Type I (small appliances), Type II (high-pressure systems), Type III (low-pressure systems), or Universal (all types). Testing is available through EPA-approved organizations including ESCO Group and others. This is a federal requirement separate from the state license.
Register with PSI Exams and Schedule Your Test
The Tennessee HVAC contractor licensing exam is administered by PSI Exams. Create an account at the PSI website, select the appropriate exam for your license classification (D-28 Mechanical or D-28 Limited), and pay the exam fee. Study both the technical HVAC content and the Tennessee business and law section — both are tested. PSI testing centers are available in Knoxville and other major Tennessee cities.
Pass the Tennessee Licensing Exam
Take and pass the PSI-administered Tennessee contractor licensing exam. A passing score is required before your application can be processed. If you do not pass on the first attempt, PSI allows retakes after a waiting period. Keep your score report — you will submit it with your license application.
Secure Insurance and Bonding
Obtain general liability insurance meeting Tennessee TDCI minimums (at least $300,000 per occurrence — strongly recommend $1,000,000 for market practicality). If you have three or more employees in construction, workers' compensation insurance is required by Tennessee law. Gather your certificates of insurance and any required surety bond documentation before submitting your application.
Submit License Application to TDCI
Complete the contractor license application through the Tennessee Department of Commerce and Insurance, Board for Licensing Contractors. Submit your exam score report, proof of experience, financial statements, insurance certificates, and the required application fee. Applications can be submitted online through the TDCI licensing portal. Processing times vary — plan for 4 to 8 weeks.
Register with Local Jurisdictions
Once your state license is issued, register with the City of Knoxville and/or Knox County building departments as applicable for your service area. Local registration allows you to pull permits directly. Keep your registration current — expired local registrations will delay permit approvals and inspections on your jobs.
Renew Every Two Years
Tennessee HVAC contractor licenses renew on a two-year cycle through TDCI. Renewal requires current insurance documentation and payment of the renewal fee. Monitor your expiration date — operating on an expired license creates serious legal and liability exposure. Set a calendar reminder at least 60 days before renewal to allow time to gather updated insurance certificates.
About This Market
Knoxville's HVAC market is steady and competitive. The metro area sits in a humid subtropical climate zone that puts real strain on equipment — hot, sticky summers and cold enough winters to keep both cooling and heating loads significant year-round. Residential work dominates the volume, driven by an aging housing stock across older neighborhoods like Fountain City, Bearden, and South Knoxville, combined with consistent new construction in suburban Knox County corridors like Powell, Hardin Valley, and Farragut. There are approximately 1,745 licensed HVAC establishments across Tennessee, with a healthy concentration in the Knoxville metro. Competition is real but not brutal — quality shops with strong reputations are busy. Cost drivers in this market include refrigerant pricing (R-410A phase-down is actively pushing costs up), labor availability, and the growing demand for higher-efficiency systems as utility costs rise. Mini-splits and variable refrigerant flow systems are gaining ground in both residential retrofits and light commercial projects.
- Number of licensed HVAC establishments in Tennessee (1,745)U.S. Census Bureau — County Business Patterns / Economic Census data for HVAC trade establishments in Tennessee
- Cost ranges for HVAC services in Knoxville, TNMarket estimate based on regional HVAC contractor pricing in the Knoxville metro area — not sourced from BLS
- Tennessee HVAC licensing requirements (D-28, D-28 Limited, exam, experience)Tennessee Department of Commerce and Insurance (TDCI), Board for Licensing Contractors — tn.gov/commerce/licensing
- EPA Section 608 Certification requirementU.S. Environmental Protection Agency — Section 608 of the Clean Air Act, 40 CFR Part 82
- Tennessee workers' compensation threshold (3 employees in construction)Tennessee Department of Labor and Workforce Development — Workers' Compensation Division
- Insurance minimums for Tennessee contractorsTennessee TDCI Board for Licensing Contractors — contractor insurance requirements documentation
- Permit requirements in Knoxville and Knox CountyCity of Knoxville Department of Building & Neighborhood Services; Knox County Building Codes Department
- Peak season timing for HVAC in KnoxvilleMarket estimate based on regional contractor activity patterns and Knoxville climate data (NOAA Climate Zone 4A)
- Average response time for quotesMarket estimate based on regional HVAC contractor operations in the Knoxville metro — not sourced from a formal study
- PSI Exams as Tennessee contractor exam administratorTennessee TDCI Board for Licensing Contractors — approved testing provider documentation
Frequently Asked Questions
How much does it cost to replace an HVAC system in Knoxville, TN?
A full central HVAC system replacement in Knoxville typically runs $5,500 to $12,000 installed, depending on system size, efficiency rating, and whether ductwork modifications are needed. A straight AC unit swap (3-ton, mid-efficiency) typically lands between $3,800 and $7,500. These are market estimates based on contractor pricing in the Knoxville metro area — costs shift with refrigerant prices, equipment availability, and labor rates. Always get at least three bids. Source: market estimate based on regional contractor data.
What license do I need to do HVAC work in Tennessee?
You need a state contractor license issued by the Tennessee Department of Commerce and Insurance (TDCI), Board for Licensing Contractors. The D-28 Mechanical Contractor license covers commercial and residential HVAC. The D-28 Limited license covers residential systems only. Both require passing the PSI licensing exam, demonstrating at least four years of verified field experience, and providing proof of insurance. EPA Section 608 Certification is also federally required for any work involving refrigerants. Source: Tennessee TDCI Board for Licensing Contractors.
Do I need a permit to replace an HVAC unit in Knoxville?
Yes. HVAC equipment replacement and installation requires a mechanical permit in both the City of Knoxville and Knox County jurisdictions. Permits are pulled through the City of Knoxville Department of Building & Neighborhood Services or Knox County Building Codes, depending on the property address. Only licensed contractors can pull mechanical permits for HVAC work in this area — homeowners cannot self-permit HVAC jobs. Skipping the permit creates liability for both contractor and property owner. Source: City of Knoxville Building & Neighborhood Services; Knox County Building Codes.
When is the busiest time of year for HVAC contractors in Knoxville?
Peak demand runs from May through July as summer heat hits and homeowners discover failed AC equipment. A secondary busy period occurs in November and December when heating systems fail at first use. During peak summer months, top HVAC shops in Knoxville can run 6 to 8 week backlogs on non-emergency installs. Emergency calls during peak season can push response times to 24 hours or more even for urgent service. Source: market estimate based on regional HVAC contractor activity in the Knoxville metro.
How many HVAC contractors are operating in Tennessee?
There are approximately 1,745 licensed HVAC establishments in Tennessee. The Knoxville metro area holds a significant share of that number, making the local market competitive but not saturated. Established contractors with strong reputations and reliable crews remain consistently busy. New entrants face real competition on price and availability, particularly during peak seasons. Source: U.S. Census Bureau data for licensed establishments in this trade category in Tennessee.
HVAC contractors in Knoxville
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