HVAC Repair

Furnace Repair in Knoxville, TN

East Tennessee winters may be milder than up north, but a furnace failure in January is still an emergency. We repair gas and electric furnaces across Knox, Blount, Anderson, and surrounding counties. Common furnace repairs include:

• Ignitor failure — the most frequent furnace call we get in Knoxville
• Flame sensor fouling — causes the furnace to light and immediately shut off
• Heat exchanger cracks — a safety issue that can allow carbon monoxide into your home
• Blower motor failure — heat is produced but never reaches your rooms
• Gas valve failure — furnace runs but produces no heat
• Limit switch trips — often a symptom of restricted airflow from a dirty filter
• Control board failure — causes erratic behavior or complete system lockout

If your furnace is short cycling, producing weak heat, or not responding at all, call (865) 933-5538. We will get there the same day in most cases.

Heat Pump Repair in Knoxville, TN

Heat pumps are the dominant heating and cooling technology in East Tennessee homes because our climate is well-suited to them. When they fail, the diagnosis is more nuanced than a straight AC or furnace call. We repair:

• Reversing valve failure — the system heats when it should cool, or vice versa
• Refrigerant charge problems — reduces both heating and cooling output
• Defrost cycle failure — causes ice to build up on the outdoor unit in winter
• Compressor faults — reduced capacity or complete failure to condition the air
• Auxiliary heat strip failure — leaves you without backup heat on the coldest nights
• Capacitor and contactor failure — same failure modes as standard AC systems

If your heat pump is blowing cold air in heat mode, struggling below 35 degrees without auxiliary heat, or running constantly without reaching your set temperature, we can find and fix the cause.

Ductless Mini-Split Repair in Knoxville, TN

Mini-splits are increasingly common in Knoxville homes, especially for sunrooms, finished basements, additions, and whole-home zoning. We service and repair all major mini-split brands including Mitsubishi, Daikin, LG, Samsung, and Fujitsu. We diagnose and fix:

• Refrigerant leaks causing low output or fault codes
• Communication errors between indoor and outdoor units
• Dirty coils reducing efficiency and airflow
• Drainage problems triggering safety shutoffs
• Inverter board and control failures
• Indoor unit fan motor failures

Air Handler and Blower Motor Repair

The air handler is the indoor half of your system — it is what actually moves conditioned air through your home. A failing blower motor or a damaged air handler coil means rooms stop getting conditioned air even when the outdoor unit is running fine. We repair blower motor failures, ECM motor faults, capacitor issues, coil damage, and air handler control board failures across all major brands.

Thermostat Repair and Replacement in Knoxville

A malfunctioning thermostat can mimic the symptoms of almost any other HVAC failure. Before you assume the worst, let us verify whether the issue is in the equipment or the controls. We repair and replace standard thermostats, programmable thermostats, and smart thermostats including Nest, Ecobee, and Honeywell. We also handle wiring issues and communication problems between the thermostat and the system.

Refrigerant Leak Detection and Repair

Low refrigerant does not just happen — it means you have a leak. Adding refrigerant without finding and repairing the leak is a temporary fix that costs you money every season. Our technicians locate leaks using electronic detection and UV dye, repair the source, pressure-test the system, and recharge it to manufacturer specifications. We handle R-22 systems in older equipment and R-410A in current systems.

Ductwork Repair in Knoxville, TN

Leaking or damaged ductwork is one of the most overlooked causes of high energy bills and uneven comfort in Knoxville homes. If one side of your house never reaches temperature, if you hear unusual airflow noises, or if your bills keep climbing despite a well-functioning system, the ducts may be the problem. We inspect, seal, and repair ductwork throughout East Tennessee homes and businesses.

Capacitor and Electrical Component Replacement

Capacitors, contactors, relays, and fuses are the most frequently replaced components in HVAC systems. They are also among the fastest repairs we make. If your outdoor unit hums but won't start, if your system trips the breaker repeatedly, or if the fan runs but the compressor does not engage, the cause is likely an electrical component. These repairs are typically completed in under an hour.

Condensate Drain Line Repair and Clearing

A clogged condensate drain line causes your system to shut off via a safety float switch, leaving you with no cooling and often a puddle near your air handler. We clear drain lines, repair damaged drain pans, replace failed condensate pumps, and install safety shutoff switches if yours does not have one. This is one of the most common summer service calls we handle in Knoxville.

Emergency HVAC Repair in Knoxville — 24 Hours a Day, 7 Days a Week

We answer emergency calls around the clock, every day of the year. If your AC fails on a Saturday night in August or your heat goes out on a Sunday in January, call (865) 933-5538. We will dispatch a licensed technician, give you an honest diagnosis, and get your system running as quickly as possible. We do not charge a different rate just because it is after hours — you get the same upfront pricing no matter when you call.

Residential HVAC Repair in Knoxville

We repair HVAC systems in single-family homes, townhomes, condos, and rental properties throughout the Knoxville area. Whether you own a 1970s ranch in North Knoxville with an aging gas furnace or a new construction home in Farragut with a two-stage heat pump, we have the equipment and experience to handle it. We work with homeowners, landlords, and property managers. We also carry parts for older equipment that other companies sometimes decline to service.

Commercial HVAC Repair in Knoxville, TN

HVAC downtime in a commercial building is not an inconvenience — it costs you in lost productivity, customer experience, and sometimes in spoiled inventory or equipment. Advanced Heat AC & Plumbing provides commercial HVAC repair for offices, retail spaces, restaurants, warehouses, medical facilities, and light industrial properties throughout Knoxville and Knox County. We understand the urgency, we carry commercial-grade parts, and we work around your schedule when possible to minimize disruption.

HVAC Brands We Repair in East Tennessee

Our technicians are trained and experienced on all major residential and commercial HVAC brands. We repair:

Carrier, Trane, Lennox, Goodman, Rheem, York, Bryant, American Standard, Daikin, Mitsubishi, Fujitsu, LG, Samsung, Ruud, Heil, Amana, Bosch, and Payne.

If you have an older unit, a less common brand, or a system installed by a previous homeowner whose paperwork you cannot find, call us. In most cases we can source parts and complete the repair. We also handle warranty repairs and document everything properly to protect your manufacturer coverage.

HVAC Repair Symptoms — What Your System Is Telling You

Most systems give you warning signs. Recognizing them early is the difference between a $150 capacitor replacement and a $3,000 compressor failure.

AC not cooling / blowing warm air — Low refrigerant, dirty condenser coil, failed capacitor, or frozen evaporator coil. Each has a different fix; a diagnostic is the only way to know which.

Furnace not heating / blowing cold air — Failed ignitor, tripped limit switch, gas valve issue, or cracked heat exchanger. The last one is a safety concern and should be addressed immediately.

System short cycling — Turning on and off every few minutes points to low refrigerant, an oversized unit, a failing thermostat, or a control board fault. Short cycling accelerates compressor wear.

Uneven heating or cooling — Some rooms comfortable, others not. Usually a ductwork issue, a zoning problem, or a failing blower. Not always the main unit.

Ice on the outdoor or indoor unit — Do not chip it off and keep running the system. Switch to fan-only mode and call us. Running a frozen system burns out the compressor.

Unusual noises — Banging or clanking means something mechanical is loose or broken. Squealing points to a motor bearing or belt. Clicking that won't stop after startup is often a control board or relay.

Musty or burning smell — Musty odors mean biological growth in the ductwork or drain pan. A burning smell means shut the system off and call immediately.

Skyrocketing energy bills — A 20 to 30 percent increase in your cooling or heating costs without a change in usage almost always means a mechanical efficiency problem.

HVAC Repair Service Areas in East Tennessee

Advanced Heat AC & Plumbing is based in Knoxville and serves a 50-mile radius across East Tennessee. We provide HVAC repair in every one of the following communities:

Knox County: Knoxville, Farragut, Powell, Corryton, and surrounding neighborhoods throughout the county.

Blount County: Maryville, Alcoa, Friendsville, Greenback, and Louisville.

Anderson County: Clinton and Oak Ridge.

Sevier County: Sevierville, Pigeon Forge, Kodak, and Dandridge.

Loudon County: Lenoir City and Louisville.

Jefferson County: Dandridge and surrounding communities.

Morgan County and Roane County: We cover these counties as well. Call us to confirm service to your specific location.

If you are searching for HVAC repair near me anywhere in Knox, Blount, Anderson, Sevier, Loudon, Jefferson, Morgan, or Roane County, we cover your area.

Related Services from Advanced Heat AC & Plumbing

We are more than an HVAC repair company. If you need it for your home's comfort and mechanical systems, we handle it.

HVAC Installation — New system installation for homes and businesses, including full system replacements when repair is no longer the right call. We install all major brands and handle permits and startup.

Preventive Maintenance and Tune-Ups — Seasonal AC and furnace tune-ups that catch problems before they become breakdowns. Spring cooling system checkout and fall heating system checkout.

HVAC Service Plan — Annual maintenance coverage with priority scheduling, seasonal tune-ups, and discounts on repairs. The most cost-effective way to maintain your system year-round.

Ductless Mini-Split Installation — New installations for additions, sunrooms, and whole-home zoning throughout Knoxville and East Tennessee.

Emergency HVAC Service — 24/7 response for system failures. No after-hours upcharge.

Commercial HVAC Services — Repair, maintenance, and installation for commercial properties across Knox County and the region.

Water Heater Installation and Repair — Standard and tankless water heater service throughout East Tennessee.

Full Plumbing Services — Drain line repair, sewer line repair and inspection, hydro-jetting, water line repair, backflow prevention, septic tank pumping, repair, and installation.

Why East Tennessee Homeowners Call Advanced Heat AC & Plumbing

We are a third-generation family business based in Knoxville. We are not a franchise. We are not a call center that dispatches subcontractors. When you call us, you get a licensed Advanced Heat AC & Plumbing technician who works for us, is trained by us, and represents us.

We offer free estimates and upfront pricing before any work begins. We do not start jobs without approval. We do not recommend repairs you do not need. We have been earning trust in Knox County for decades and we intend to keep it.

Financing is available through Wisetack — up to 24 months no-interest — for repairs or replacements that do not fit the budget right now. Pre-qualification takes minutes and does not affect your credit score.

We are licensed, bonded, and insured. License #48048.

Call (865) 933-5538 or book online to schedule your HVAC repair in Knoxville, TN.