Find a 24/7 HVAC Technician in Knoxville, TN
When your AC or heat fails on the worst day of the year, every hour matters. Connect with an independent local HVAC pro — our phone line is open 24/7.
By Gyanesh Gulshan — Founder, Cool Call Pro
HVAC emergencies in Knoxville
Call Now — (844) 582-179524/7 call line · call to check availability in Knoxville
AC out, blowing warm, or iced over
Outdoor unit silent · indoor blower running but warm air · ice on the refrigerant lines · short-cycling on/off. Possible causes range from electrical parts (capacitor, contactor) to a refrigerant problem — both need a technician to diagnose.
Furnace not igniting or blowing cold
Furnace won't ignite · blowing cold air · short-cycling · burning smell on first startup. If you smell gas, leave the building right away without flipping switches or using phones inside, then call 911 or your gas utility’s emergency line from outside.
Banging, screaming, or grinding outdoor unit
Loud bangs · metal-on-metal screaming · grinding or rattling from the outdoor unit. Possible causes include a failing fan motor, a loose blower wheel, or worn compressor bearings. Turn the system off at the thermostat and call a technician.
How Cool Call Pro works in Knoxville
24/7 Knoxville call line
Our phone line is open 24/7. Calls are routed to independent HVAC providers in the Knoxville area where one is available; hours, weekend and holiday coverage, and overnight surcharges are set by each provider.
Call to check availability
Provider availability varies by address and time of day, so call to check availability in Knoxville. The neighborhoods and ZIPs listed for this page are in the Services & service area section below.
Check licenses yourself
Cool Call Pro does not check contractor licenses or insurance. Verify any contractor’s license with the Tennessee license lookup. Tennessee rules are in the local data section below.
Knoxville's mixed-humid climate & your HVAC
This Zone 4A (Mixed-Humid) climate splits the year between heating and cooling load. Federal SEER2 14.3 (Southeast Region) minimum applies to new AC equipment. A heat pump handles both heating and cooling from one outdoor unit.
Avg summer high
IECC zone (mixed-humid)
Avg winter low
Federal SEER2 minimum
Days/yr above 90°F
Days/yr below 32°F
Knoxville had an estimated 202,021 residents on July 1, 2025. In Knoxville, the median home was built in 1974 with a current median value of $214,000. Around 47% of homes are owner-occupied. About 25% of households heat with natural gas vs. 74% electric. The Tennessee grid averages $0.13/kWh. Sources: U.S. Census population estimates · U.S. Census ACS 2019–2023 5-year tables B25035 · B25077 · B25003 · B25040 · U.S. EIA state rates.
Read our guide on heat pump guide.
HVAC in Knoxville, TN: local data & sources
Every numerical claim below references a federal, state, or municipal primary source — NOAA climate normals, U.S. Census ACS, the Tennessee licensing authority, and your local utility's published rebate program.
NOAA NCEI 1991–2020 Normals
McGhee Tyson Airport (KTYS) is the official NOAA reference station for Knoxville. Per the NOAA NCEI U.S. Climate Normals 1991–2020 (station USW00013891), Knoxville records approximately 3,528 annual heating degree days against 1,574 cooling degree days, an annual precipitation normal of approximately 52 inches, and an annual snowfall normal of 4.6 inches. The city averages 36.5 days per year above 90°F and 67 days below freezing. The roughly 2.2:1 HDD-to-CDD ratio reflects a true dual-load climate in the eastern Tennessee Valley — meaningful heating and cooling demand, with the 52 inches of annual precipitation driving heavy summer humidity loads. A distinctive operational concern in Knoxville is summer ground-level ozone: the Tennessee Department of Environment & Conservation periodically issues Code Orange air-quality alerts for the Knoxville-Sevierville region, and EPA designations (EPA Region 4 technical support document) historically identified higher-elevation monitors within Great Smoky Mountains National Park as exceeding ozone thresholds. Real-time alerts are tracked on EPA AirNow; sensitive-population HVAC operation should incorporate fresh-air filtration on alert days.
U.S. Census ACS 2023 5-Year
The U.S. Census Bureau ACS 2023 5-year estimates (Tables B25040, B25003, B25077 and B25035 for Knoxville city, Tennessee) report 84,882 occupied housing units with a median year built of 1974. Heating-fuel distribution: 74.0% electricity (62,794 units), 24.7% utility natural gas (20,963 units), and 410 units on bottled/tank/LP gas. The strong electric-heating majority is characteristic of TVA distributor territories, where historically affordable hydroelectric and nuclear power made electric-resistance and heat-pump heating economically competitive against gas. Owner-occupancy is 46.6% (reflecting the University of Tennessee’s significant rental footprint), and the median home value is $214,000. Tennessee’s residential average electricity rate of 12.82¢/kWh (EIA Electric Power Monthly) reinforces the economic case for heat-pump primary heat.
Tennessee Licensing Authority
Tennessee requires HVAC contractors performing projects of $25,000 or more to hold a Mechanical Contractor license issued by the Tennessee Board for Licensing Contractors (state contractor regulator). The HVAC-specific subclassification is CMC-C (Mechanical — HVAC/Refrigeration Contractor), with a $250 application fee, a $53 statewide business and law exam, and a $106 statewide trade exam. Bonding is not automatically required at the state level but may be triggered by the Board’s financial-statement review or by local Knox County permitting requirements. Mechanical permits in Knoxville are issued by the City of Knoxville Plans Review & Inspections Division — verify the current fee schedule and any local bonding requirement directly with that office before contracting.
TVA EnergyRight
Knoxville’s electric service is provided by the Knoxville Utilities Board (KUB), a municipally owned utility that distributes wholesale power from the Tennessee Valley Authority. Residential HVAC rebates are administered through KUB’s partnership with the TVA EnergyRight program. Per the EnergyRight heat pump page, the published heat pump rebate is $500 for 15–16.99 SEER2 or $800 for 17 SEER2 or higher (TVA EnergyRight plus the local power company), with $50 for a heat pump or central AC tune-up and $300 for duct sealing, repair, insulation or replacement. Rebate-eligible upgrades must be completed by a member of the TVA Quality Contractor Network (QCN). Tennessee’s federally funded HEEHR program (approximately $83.4 million allocation, administered by TDEC’s Office of Energy Programs with the Tennessee Valley Authority as implementer) received a conditional DOE award in January 2025. As of September 2026, TDEC states: “Funding for the Tennessee IRA Home Energy Rebate Programs is not yet available.” Until it launches, TVA EnergyRight rebates remain the primary published path.
The federal Section 25C Energy Efficient Home Improvement Credit was terminated for installations placed in service after Dec 31, 2025 by the One Big Beautiful Bill Act (Public Law 119-21). Check your state energy office and utility for current rebate programs. See our HVAC financing options for what's still available.
Services & service area
Services you can ask about
- Emergency AC Repair in Knoxville
- Furnace Repair & Heating Service in Knoxville
- Heat Pump Installation & Dual-Fuel Systems
- Central Air Conditioning Installation & Replacement
- HVAC System Maintenance & Seasonal Tune-Ups
Neighborhoods & ZIPs listed for Knoxville
- Old North Knoxville
- Sequoyah Hills
- Fountain City
- Bearden
- Fourth & Gill
- ZIP codes: 37917, 37919, 37918, 37920, 37916
HVAC repair costs: national ranges for Knoxville, TN homeowners
Cool Call Pro editorial estimates of typical U.S. prices from our 2026 cost guide — not quotes and not Knoxville-specific. Actual price varies by provider and complexity.
Diagnostic / service call
$65–$150
Some providers credit it toward the repair — ask when you call
Minor AC repair
$75–$500
Capacitor, contactor, thermostat, drain line
Refrigerant recharge
$150–$600
R-410A per recharge; leak fix extra
After-hours surcharge
$100–$300
Added to repair cost on emergency calls
See full repair, install, and replacement ranges in our 2026 HVAC Cost Guide and how we build these ranges →
Ready to talk to an HVAC pro in Knoxville?
Independent technicians · 24/7 call line · Verify any contractor’s license with the Tennessee license lookup
Call Now — (844) 582-1795Disclosure: We are a referral service and may receive compensation for qualified calls. Calls may be routed to an independent provider network and may be recorded. Pricing and availability vary by provider and location.
Frequently Asked Questions — Knoxville, TN
Yes, ensure your contractor files a mechanical permit with the City of Knoxville Plans Review & Inspections Division. Pulling the correct permits protects you as a homeowner and ensures work is inspected to code.
Rebate programs for Knoxville homeowners are summarized, with sources, in the Local Rebates & Permits card above. Confirm current amounts and eligibility with your utility (KUB (Knoxville Utilities Board, TVA distributor)) before scheduling work. The federal Section 25C credit was terminated for installations placed in service after Dec 31, 2025 (One Big Beautiful Bill Act, P.L. 119-21); check your state energy office and utility rebate programs instead.
The neighborhoods and ZIP codes listed for Knoxville are in the ZIPs & Neighborhoods card above. Provider availability varies by address, so call (844) 582-1795 to check availability in Knoxville.
Cool Call Pro’s editorial estimate for a standard AC replacement in Knoxville is $3,800–$6,500, and for furnace installations $3,000–$6,000. These are our own estimates, not quotes or survey data — see how we build cost ranges. Costs vary with system size, efficiency rating, and installation complexity. In Tennessee, new AC units must meet a minimum SEER2 14.3 (Southeast Region) rating.
Tennessee's Board for Licensing Contractors requires a contractor license with the CMC-C (HVAC) classification for HVAC projects of $25,000 or more. Most smaller HVAC projects are regulated by the city or county where the work is done, and some counties require a state Home Improvement license for HVAC work under $25,000. Always verify your contractor’s credentials before authorizing work. For Knoxville residents, permits are filed through the City of Knoxville Plans Review & Inspections Division.