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 now — 24/7 dispatch nationwide.
By Gyanesh Gulshan — Founder, Cool Call Pro
Common Knoxville HVAC emergencies
Call Now — (844) 582-179524/7 dispatch · Knoxville-area network
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. The most common cause is electrical (capacitor, contactor) or refrigerant — both require a technician.
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 immediately and call 911 first.
Banging, screaming, or grinding outdoor unit
Loud bangs · metal-on-metal screaming · grinding or rattling from the outdoor unit. Failing fan motors, loose blower wheels, and worn compressor bearings are the usual causes. Turn the system off and call — running through these noises spreads the damage.
About the Cool Call Pro Knoxville network
24/7 Knoxville Dispatch
Independent HVAC providers offering round-the-clock emergency response across the Knoxville metro — including weekends and holidays. Overnight surcharges are set by the individual provider.
Knoxville Metro Coverage
Independent providers across major Knoxville neighborhoods, routed to your area by current availability. The full ZIP-level coverage detail is in the Services & service area section below.
State License Required
All HVAC contractors in Tennessee should hold a current State License Required (TN Board - CMC-C HVAC License). Verify any contractor at the Dept. of Commerce & Insurance, Board for Licensing Contractors (projects >$25,000) before you hire.
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. Heat pumps that handle both heating and cooling from one outdoor unit are an increasingly popular choice.
Avg summer high
IECC zone (mixed-humid)
Avg winter low
Federal SEER2 minimum
Days/yr above 90°F
Days/yr below 32°F
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 ACS · 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 3,636 annual heating degree days against 1,526 cooling degree days, an annual precipitation normal of approximately 52 inches, and an annual snowfall normal of 6.5 inches. The city averages 31.4 days per year above 90°F and 67 days below freezing. The roughly 2.4:1 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 2022 5-Year
The U.S. Census Bureau ACS 2023 5-year estimates (Tables B25040 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) is among the lowest in the project, reinforcing 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. Current published amounts: up to $1,500 for a qualifying high-efficiency heat pump (TVA Preferred tier), with a typical baseline rebate of $500–$800 depending on efficiency and local power-company match; up to $700 for a qualifying high-efficiency central air conditioner; and up to $1,300 for a qualifying ENERGY STAR heat pump water heater. TVA EnergyRight rebates require installation by a member of the TVA Quality Contractor Network (QCN); gas-to-electric conversion is not currently rebate-eligible (replacement of existing electric heating is required). Tennessee’s federally funded HEAR program (approximately $83.4 million allocation, administered by TDEC Office of Energy Programs in partnership with TVA’s QCN) received conditional DOE approval in January 2025 with statewide launch targeted for Q3 2026. Once active, HEAR will allow gas-to-heat-pump conversion rebates of up to $8,000 per qualifying household; until then, existing 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). State HEAR rebates and utility programs remain in effect. See our HVAC financing options for what's still available.
Services & service area
What our network covers
- 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
Where we connect homeowners
- Old North Knoxville — ZIP 37917
- Sequoyah Hills — ZIP 37919
- Fountain City — ZIP 37918
- Bearden — ZIP 37920
- Fourth & Gill — ZIP 37916
Common HVAC repair costs in Knoxville, TN
Typical 2026 ranges. Actual price varies by provider and complexity.
Diagnostic / service call
$65–$150
Often waived if you book the repair
Common AC repair
$90–$450
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 →
Ready to talk to a Knoxville HVAC pro?
Independent technicians · 24/7 dispatch · State License Required-verified network
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.
Homeowners may qualify for savings through KUB (Knoxville Utilities Board, TVA distributor). Check with TVA EnergyRight for current offers. The federal Section 25C credit was terminated for installations after Dec 31, 2025 (OBBBA, P.L. 119-21); check current state and utility programs for 2026.
Our network covers Knoxville and surrounding areas including 37917, 37919, 37918, 37920, 37916. Call (844) 582-1795 to verify service availability for your specific ZIP code.
A standard AC replacement in Knoxville typically costs $3,800–$6,500, and furnace installations run $3,000–$6,000. Costs vary based on system size, efficiency rating, and installation complexity. In Tennessee, new AC units must meet a minimum SEER2 14.3 (Southeast Region) rating.
In Tennessee, HVAC contractors should hold a State License Required (TN Board - CMC-C HVAC License). Always verify your contractor's credentials before authorizing work. For Knoxville residents, permits are filed through the City of Knoxville Plans Review & Inspections Division.