Top 10 furnace repair services in Lake Zurich, IL

Porch Pro Headshot C R Mechanical Svc
Furnace Repair
Serves Lake Zurich, Illinois
CR Mechanical Services provides Comfort Solutions to fit your needs. from All Major manufacture Heating and Cooling Equipment Service, Repairs and Replacements to whole house Insulation solutions. kitchen and bathroom fixture Rejuvenation's. Water Removal and Distributions Systems design & Installa...Read more about C R Mechanical Svc
CR Mechanical Services provides Comfort Solutions to fit your needs. from All Major manufacture Heating and Cooling Equipment Service, Repairs and Replacements to whole house Insulation solutions. kitchen and bathroom fixture Rejuvenation's. Water Removal and Distributions Systems design & Installa...Read more about C R Mechanical Svc
Porch Pro Headshot Shavitz Heating and Air Conditioning
Furnace Repair
Serves Lake Zurich, Illinois
(4,802)
From AC repair and heating installation to commercial boilers and indoor air filters, the Chicago HVAC experts at Shavitz Heating and Air Conditioning can do it all. When you’re ready to work with a company that has a 100–year track record of excellent heating and air conditioning service, call Sha...Read more about Shavitz Heating and Air Conditioning
From AC repair and heating installation to commercial boilers and indoor air filters, the Chicago HVAC experts at Shavitz Heating and Air Conditioning can do it all. When you’re ready to work with a company that has a 100–year track record of excellent heating and air conditioning service, call Sha...Read more about Shavitz Heating and Air Conditioning
Porch Pro Headshot Elite Air Inc.
Furnace Repair
Serves Lake Zurich, Illinois
(275)
Why Rely on Us for Your Indoor Air Quality Needs We like to think of ourselves as a Customer Care Service that happens to be in Heating and Air Conditioning. Unlike many "be there in a hour, throw something in, grab the money and run" type of companies, we at Elite Air Inc. believe in investing for...Read more about Elite Air Inc.
Why Rely on Us for Your Indoor Air Quality Needs We like to think of ourselves as a Customer Care Service that happens to be in Heating and Air Conditioning. Unlike many "be there in a hour, throw something in, grab the money and run" type of companies, we at Elite Air Inc. believe in investing for...Read more about Elite Air Inc.
Porch Pro Headshot Midwest Comfort Heating & Cooling
Furnace Repair
Serves Lake Zurich, Illinois
(249)
Midwest Comfort is a family-owned and operated business that offers you and your family the ultimate in peace of mind, ensuring that your equipment operates safely and efficiently. We pride ourselves in building trusting relationships with our customers through exceptional service and savings. We ma...Read more about Midwest Comfort Heating & Cooling
Midwest Comfort is a family-owned and operated business that offers you and your family the ultimate in peace of mind, ensuring that your equipment operates safely and efficiently. We pride ourselves in building trusting relationships with our customers through exceptional service and savings. We ma...Read more about Midwest Comfort Heating & Cooling
Porch Pro Headshot Effective Air, Inc.
Furnace Repair
Serves Lake Zurich, Illinois
(193)
Since 1940, Effective Air has been delivering superior customer-focused heating and air conditioning service to our neighbors in Glenview and other surrounding communities. We're also pleased to assist our customers with their water purification, duct cleaning and indoor air quality needs. Helping k...Read more about Effective Air, Inc.
Since 1940, Effective Air has been delivering superior customer-focused heating and air conditioning service to our neighbors in Glenview and other surrounding communities. We're also pleased to assist our customers with their water purification, duct cleaning and indoor air quality needs. Helping k...Read more about Effective Air, Inc.
Porch Pro Headshot Robinson Heating & Cooling
Furnace Repair
Serves Lake Zurich, Illinois
(98)
Robinson Heating & Cooling has been serving the northern Lake County and southeastern Kenosha areas since 1962. In 1987, David Brown, the current president, purchased Robinson Heating & Cooling and has operated and served as President to this day. With a longstanding history of reliability and quali...Read more about Robinson Heating & Cooling
Robinson Heating & Cooling has been serving the northern Lake County and southeastern Kenosha areas since 1962. In 1987, David Brown, the current president, purchased Robinson Heating & Cooling and has operated and served as President to this day. With a longstanding history of reliability and quali...Read more about Robinson Heating & Cooling
Porch Pro Headshot D's Air & Heating, Inc.
Furnace Repair
Serves Lake Zurich, Illinois
(73)
Commitment, Dedication, Professionalism, Experience, Is Our Goal. Comfort Specialist You Can Depend On! Don't "FREEZE" Call D's...For All Your Heating, Ventilation And Air Conditioning Needs. A family owned and operated business here to deliver customer satisfaction in the heating, air con...Read more about D's Air & Heating, Inc.
Commitment, Dedication, Professionalism, Experience, Is Our Goal. Comfort Specialist You Can Depend On! Don't "FREEZE" Call D's...For All Your Heating, Ventilation And Air Conditioning Needs. A family owned and operated business here to deliver customer satisfaction in the heating, air con...Read more about D's Air & Heating, Inc.
Porch Pro Headshot R-Reliable Heating & Cooling
Furnace Repair
Serves Lake Zurich, Illinois
(6)
R- Reliable Heating and Cooling has been providing customers with quality work at unbeatable prices for over 30 years! Specializing in Installation and Service of Peerless Boilers, Stainless Steel Chimney Liners, Furnaces and Central AC Systems. For More Information Call 773 600 6060!
R- Reliable Heating and Cooling has been providing customers with quality work at unbeatable prices for over 30 years! Specializing in Installation and Service of Peerless Boilers, Stainless Steel Chimney Liners, Furnaces and Central AC Systems. For More Information Call 773 600 6060!
Porch Pro Headshot Murray HVAC  Inc.
Furnace Repair
Serves Lake Zurich, Illinois
(28)
Murray HVAC, Inc. is a family owned and operated business that has been servicing the North Shore of Chicago since 1948. We are committed to Honesty, Quality and Service, which means you'll get it done right the first time and at a fair price. We are experts at solving comfort issues and we speciali...Read more about Murray HVAC Inc.
Murray HVAC, Inc. is a family owned and operated business that has been servicing the North Shore of Chicago since 1948. We are committed to Honesty, Quality and Service, which means you'll get it done right the first time and at a fair price. We are experts at solving comfort issues and we speciali...Read more about Murray HVAC Inc.
Porch Pro Headshot Approved Comfort Heating & Air Conditioning
Furnace Repair
Serves Lake Zurich, Illinois
We are a family owned, full service, heating and air conditioning company. We see to all of your heating and cooling needs from installations, repairs, to maintenance. We also service hot water heaters, humidifiers, air cleaners, generators, unit heaters, RTUs, (commercial Roof Top Units) and more. ...Read more about Approved Comfort Heating & Air Conditioning
We are a family owned, full service, heating and air conditioning company. We see to all of your heating and cooling needs from installations, repairs, to maintenance. We also service hot water heaters, humidifiers, air cleaners, generators, unit heaters, RTUs, (commercial Roof Top Units) and more. ...Read more about Approved Comfort Heating & Air Conditioning

Frequently asked questions about heating & furnace repair companies

Your furnace should be cleaned every year or every two years at the most. A yearly furnace cleaning can catch small problems and fix them before they become serious repairs. It's like how changing the oil in your car may prevent a breakdown in the future. You should plan to have your furnace cleaned before you need it in the winter. Most people leave this to the last minute, and HVAC companies become very busy as the temperature drops.

Some indicators that your furnace needs to be cleaned:

  • The temperature is inconsistent from room to room.
  • Your furnace is struggling to maintain the temperature you set.
  • The furnace produces no heat at all.
  • You have a higher than expected energy bill after turning it on.
  • You smell rubber, smoke, or oil when you turn it on. (It's normal to smell dust).
  • Your furnace flame is any color but blue, which can indicate an imbalance in the gasses.
  • It makes a loud bang, howling, or whistling sound. This points to clogged air filters, dirty burners, or a restricted fuel supply.

Some people consider cleaning the furnace in the spring rather than in the fall. The best practice is to vacuum the furnace out in the spring, then do your annual maintenance in the late summer or fall.

Regular furnace maintenance can extend your furnace’s life by years and prevent some costly repairs. Regular furnace maintenance involves taking apart essential components, inspecting and cleaning them, then reassembling them for use. These components include your furnace filter, blower, burners, and flame sensors.

You can tackle a lot of this work on your own. It may take a few hours to familiarize yourself with the tools and equipment if it's your first time maintaining your furnace. Once you know the drill, furnace maintenance shouldn’t take more than a couple of hours. Start by shutting off the furnace's electrical power and fuel supply. Once that’s done, the combustion chamber can be accessed, vacuumed out, and inspected for holes. If you find any holes, patch them with foil tape.

Next, thoroughly clean the blower compartment. This will remove dirt and debris. Like with the combustion chamber, you or a professional need to inspect for any holes. Don’t forget to replace the air filter. You may be able to upgrade the air filter so it protects against mildew, pollen, and other airborne allergens. If you have an oil furnace, you’ll also want to replace the oil filter. This should be done annually. Finally, oil the machine bearings, taking care not to over-lubricate them.

If your furnace makes odd noises, you should hire a professional as soon as possible. There are a few other indicators that your furnace needs professional attention. Excessive soot could mean your burners need adjustment or that the heat exchanger needs replacing. If your flame is pale in color or irregular, this can indicate dirty burners or a cracked heat exchanger. This is a potential hazard and requires a professional to investigate. If your furnace is short-cycling (which means it only runs for a short period of time before shutting off), you may have a thermostat issue or an overheating exchanger. This also requires the expertise of a professional.

You should have your furnace serviced annually for the best results. Some people will wait every two years, though better maintenance schedules often mean fewer surprises. Most times, when a furnace stops providing heat without warning in the winter, the issue could have been solved with a maintenance call the season beforehand. Maintained furnaces run at their best efficiency, which helps your energy bill.

Furnace services can reveal carbon monoxide leaks, a health hazard that needs to be fixed immediately. If left untreated, carbon monoxide can lead to dizziness, nausea, headaches, and even death.

When hiring a professional, whether for annual maintenance or repairs, a quick search for “Furnace repair near me” will bring up several local companies to hire. Most states require HVAC companies to be licensed. They should also be fully insured and bonded. A great HVAC repair company will be transparent in what they do and what they charge, and they should be able to show documentation if requested. HVAC companies get quite busy as the temperature drops, so consider calling in the late summer and get ahead of the rush.

Your HVAC company should be able to give you an estimate of what repairs will cost. Oil and gas furnace repairs cost more than their electrical competitors, but their maintenance costs should be similar. If your furnace is over ten years old, you should prioritize annual maintenance. Most furnaces need to be replaced within ten to twenty years. Most furnace companies will advise that any serious repairs to an older furnace may not last long and that replacing your furnace would be the best option.

If your furnace is not producing heat, there are several components you should check. Start with the thermostat - is it switched to “heat”? What temperature does the thermostat say compared to the actual room temperature? Try setting the thermostat to five degrees higher and see if the furnace kicks on. Replace the battery and check the wiring for any breaks. Ensure there are no loose wires within the thermostat, and blow away any dust while you’re in there.

Check the fuse box and the power switch for the furnace and ensure that everything is switched on. Occasionally, a clogged filter can cause the furnace to shut off, so check your filters next. The gas line should be open, but may be switched off for whatever reason. If the drain hose is particularly dirty or the chimney flue is clogged, this could also be why your furnace doesn’t produce any heat. Clean them of dust and debris and try the furnace again. After that, check the heat vents and ducting. Clogs in those areas may also affect your furnace’s heat.

If you’ve tried all that and your furnace still isn’t turning on, it’s time to call a professional to get your furnace repaired. They’ll also run through these basic troubleshooting steps, then move on to the complex components and causes of failure within furnaces. If your furnace is older than fifteen years or breaks down regularly, you may want to consider replacing it. New models are more efficient, and repairs can be expensive in the long run.

If you’re looking to have your furnace serviced or tuned up, the cost will depend on the type. An electric furnace can cost between $70 to $130 for a tune-up. Gas furnace tune-ups can cost between $80 to $170, whereas oil furnaces can cost between $100 to $200. A tune-up involves an inspection of the flues and vents, air filters, ignitor switches, fan belts, blowers, motors, electrical components, the heat exchanger, the condensate drain, and testing the thermostat.

Some HVAC companies have two standards for maintenance calls. A basic maintenance call will include a cleaning and offer a diagnostics report. The advanced maintenance call will involve a full tune-up and cleaning of your furnace’s sensors. This can cost between $130 to $200, whereas the basic (or standard) may cost between $70 to $130.

Other factors may alter the cost of furnace maintenance. If you do this at a slower time of year for HVAC companies, you may pay less. Also, if you have several HVAC systems, you may be able to get a discount. You may be charged more if your HVAC system is hard to reach. Some HVAC companies offer a discount for a maintenance plan. Others may charge more if you haven’t serviced the furnace in over a year, as more work will be involved.

The cost to repair a furnace is much higher than the cost to maintain one. The average repair cost for a furnace is anywhere from $100 to $600, based on the issue. There's a hidden cost as well - if your furnace is under warranty and you neglected the annual maintenance, the furnace company may not honor the warranty.

Furnaces make several different noises which indicate different problems. If your furnace is banging or booming when you turn it on, this likely indicates a delayed ignition. This can be attributed to a defective ignitor, a weak flame or pilot light, low gas pressure, or a burner malfunction. You should consult an HVAC professional for all these issues, as working with gas and fuel can be tricky.

Intermittent banging or booming is most likely caused by expanding and detracting ductwork. This doesn't necessarily need a fix, unless the noise is preventing you from sleeping at night. You’ll need to fortify the ductwork or replace it with round ductwork. Your furnace may make a dry squeal if any belts or bearings are worn. You can fix this yourself for relatively cheap, but a worn belt points to a lack of cleaning and maintenance. You may want to call a professional to inspect for other potential repairs that may be in your future.

If your furnace makes a high-pitched wail, it’s most likely an airflow problem. A dirty air filter and closed or blocked vents are your likely culprits. Rattling means a part is loose or your heat exchanger is cracked. If you hear the rattling right after you turn the furnace on, it's probably the heat exchanger. The rattling is likely the metal coils expanding. If you hear a constant humming, this is likely a motor problem for either the blower or the inducer. Humming sounds from your furnace requires a professional right away.

A furnace is a large machine. Like a car engine, if it’s making a noise that it shouldn’t, this is usually a warning sign before it breaks down entirely. Every time you use your furnace while it needs repairing, you risk damaging it further and racking up a higher repair bill.

Recent reviews for Lake Zurich furnace repair services

205884

Thanks RReliable for replacing my furnace....professional, prompt and very reasonable pricing.

- Carlos Williams
204828

Guys were very professional, each installer introduced his self to me, they did a great job and cleaned up then when the they finished they each guy thanked me. I was blown away.

- Lenox Johnson
204801

Working with R-Reliable Heating and Cooling was nothing short of amazing. The crew was pleasant, quick, and their work was very neat. Best experience I’ve had!

- Mhaylon R
205599

My mom has her furnace serviced annually by R-Reliable and she is always pleased. That made me get mine installed by them as well. Great install guys! Thank you

- Cortez Carter
552496

He was honest and very affordable and recommend him to anybody.

- Lupe Boyster

All Heating & Furnace Repair Companies in Lake Zurich, IL

Porch Pro Headshot Best Heating and Cooling
Furnace Repair
Serves Lake Zurich, Illinois
Best Heating and Cooling Inc in New Lenox. is licensed, bonded, and insured family owned heating and air conditioning company with over 28 years experience in the field. We pride ourselves in quality service, so you and your family can have a safe and comfortable home. We realize that in order for a...Read more about Best Heating and Cooling
Best Heating and Cooling Inc in New Lenox. is licensed, bonded, and insured family owned heating and air conditioning company with over 28 years experience in the field. We pride ourselves in quality service, so you and your family can have a safe and comfortable home. We realize that in order for a...Read more about Best Heating and Cooling
Porch Pro Headshot Mad Dash, Inc.
Furnace Repair
Serves Lake Zurich, Illinois
Mad Dash, Inc. sets the quality standard for energy management technology installation and implementation nationwide. We help utilities, technology providers, consultants, and commercial and industrial customers achieve their challenging energy management objectives. We deliver the highest quality w...Read more about Mad Dash, Inc.
Mad Dash, Inc. sets the quality standard for energy management technology installation and implementation nationwide. We help utilities, technology providers, consultants, and commercial and industrial customers achieve their challenging energy management objectives. We deliver the highest quality w...Read more about Mad Dash, Inc.
Porch Pro Headshot DW Heating
Furnace Repair
Serves Lake Zurich, Illinois
(4)
DW Heating is a newly minted full service HVAC company based in Westmont, IL and serving surrounding areas. We come with at least 15 years of experience in HVAC both large or small, residential or commercial applications.DW Heating not only wants to keep our client's stay at a comfortable temperatur...Read more about DW Heating
DW Heating is a newly minted full service HVAC company based in Westmont, IL and serving surrounding areas. We come with at least 15 years of experience in HVAC both large or small, residential or commercial applications.DW Heating not only wants to keep our client's stay at a comfortable temperatur...Read more about DW Heating
Porch Pro Headshot Ultra Lux Construction
Furnace Repair
Serves Lake Zurich, Illinois
(26)
Experienced 5 star Residential and Commercial Real Estate Developer and General Contractor for all you remodeling needs in Chicago and suburbs. Licensed, bonded and insured.
Experienced 5 star Residential and Commercial Real Estate Developer and General Contractor for all you remodeling needs in Chicago and suburbs. Licensed, bonded and insured.
Porch Pro Headshot A Custom Heating & Air Condit Longing
Furnace Repair
Serves Lake Zurich, Illinois
We specialize in residential HVAC work. All furnaces,Boilers, A/C systems, Humidifiers, Indoor air quality, Unico/Space pac systems, and Air balancing( making your heating and cooling more efficient and fixes uneven temps). We have been in business on the north west side of Chicago for over 21 year...Read more about A Custom Heating & Air Condit Longing
We specialize in residential HVAC work. All furnaces,Boilers, A/C systems, Humidifiers, Indoor air quality, Unico/Space pac systems, and Air balancing( making your heating and cooling more efficient and fixes uneven temps). We have been in business on the north west side of Chicago for over 21 year...Read more about A Custom Heating & Air Condit Longing
Porch Pro Headshot eMotorStore
Furnace Repair
Serves Lake Zurich, Illinois
Our wide, versatile selection of electric motor products is there to meet your needs wholly and immediately. Customer-centric product specialists are ready for questions or feedback (6)-days per week! Providing value is a cornerstone of what we do here at eMotorStore.com
Our wide, versatile selection of electric motor products is there to meet your needs wholly and immediately. Customer-centric product specialists are ready for questions or feedback (6)-days per week! Providing value is a cornerstone of what we do here at eMotorStore.com
Porch Pro Headshot Giant Mechanical, Inc.
Furnace Repair
Serves Lake Zurich, Illinois
Giant Mechanical, Inc. has been satisfying customers with competitive pricing and unparalleled workmanship. Giant Mechanical, Inc. builds excellence into every project it undertakes. As a full-service contractor, it provides an integrated solution to your heating, refrigeration, ventilation, and air...Read more about Giant Mechanical, Inc.
Giant Mechanical, Inc. has been satisfying customers with competitive pricing and unparalleled workmanship. Giant Mechanical, Inc. builds excellence into every project it undertakes. As a full-service contractor, it provides an integrated solution to your heating, refrigeration, ventilation, and air...Read more about Giant Mechanical, Inc.
Porch Pro Headshot Average  Joe's Heating & Cooling
Furnace Repair
Serves Lake Zurich, Illinois
We are a family owned and operated company providing above average service at below average prices. We keep our overhead cost low which allows us to keep our prices down providing a better value to the homeowner. When you call you will be dealing directly with the owner so you can rest assured you...Read more about Average Joe's Heating & Cooling
We are a family owned and operated company providing above average service at below average prices. We keep our overhead cost low which allows us to keep our prices down providing a better value to the homeowner. When you call you will be dealing directly with the owner so you can rest assured you...Read more about Average Joe's Heating & Cooling
Porch Pro Headshot Biermann Heating and Air Conditioning
Furnace Repair
Serves Lake Zurich, Illinois
I've built this small company from the ground up. My customer's trust me and call when they have issues. I treat everyone with respect, because I believe in treating others the way that I would expect to be treated. I'm a firm believer in when we say Built one customer at a time. Dependability wi...Read more about Biermann Heating and Air Conditioning
I've built this small company from the ground up. My customer's trust me and call when they have issues. I treat everyone with respect, because I believe in treating others the way that I would expect to be treated. I'm a firm believer in when we say Built one customer at a time. Dependability wi...Read more about Biermann Heating and Air Conditioning
Porch Pro Headshot Elite Appliance 847-581-2880
Furnace Repair
Serves Lake Zurich, Illinois
We are family appliance repair business serving the Chicagoland area and most suburbs. We have over 20 years of experience with major brand appliances (GE, Whirlpool, Amana, Bosch, Maytag, Kitchen Aid) including high end (Sub Zero, Viking, Dacor, Miele, Marvel, Thermador). Our Technicians will diagn...Read more about Elite Appliance 847-581-2880
We are family appliance repair business serving the Chicagoland area and most suburbs. We have over 20 years of experience with major brand appliances (GE, Whirlpool, Amana, Bosch, Maytag, Kitchen Aid) including high end (Sub Zero, Viking, Dacor, Miele, Marvel, Thermador). Our Technicians will diagn...Read more about Elite Appliance 847-581-2880
Porch Pro Headshot Ronnix HVAC
Furnace Repair
Serves Lake Zurich, Illinois
Ronnix HVAC Chicago, IL, 60629 (708) 566-7144 We are Ronnix HVAC and we provide professional HVAC Services in the Chicago, IL area! Do not hesitate to contact us now! HVAC Services, HVAC Company, HVAC Experts, HVAC System, HVAC Contractors Kenwood, IL HVAC Mechanic, New HVAC System, Commercial HVAC...Read more about Ronnix HVAC
Ronnix HVAC Chicago, IL, 60629 (708) 566-7144 We are Ronnix HVAC and we provide professional HVAC Services in the Chicago, IL area! Do not hesitate to contact us now! HVAC Services, HVAC Company, HVAC Experts, HVAC System, HVAC Contractors Kenwood, IL HVAC Mechanic, New HVAC System, Commercial HVAC...Read more about Ronnix HVAC
Porch Pro Headshot Family Mechanical
Furnace Repair
Serves Lake Zurich, Illinois
Excellence has been our hallmark since 2014 Family Mechanical is a customer focused heating and air-conditioning company that was originally started in 2014. Located in Lake in the Hills, IL, we employ highly trained people whose goal is to make our company the best service company in Chicago's Nort...Read more about Family Mechanical
Excellence has been our hallmark since 2014 Family Mechanical is a customer focused heating and air-conditioning company that was originally started in 2014. Located in Lake in the Hills, IL, we employ highly trained people whose goal is to make our company the best service company in Chicago's Nort...Read more about Family Mechanical
Porch Pro Headshot ServPro of Elks Grove/Itasca/Roselle/Palatine/Rolling Meadows
Furnace Repair
Serves Lake Zurich, Illinois
ServPro of Elks Grove/Itasca/Roselle/Palatine/Rolling Meadows, based in Elk Grove Village, is an HVAC company that was founded in 2000. They offer gas appliance connection, water line installation and more. The United States Environmental Protection Agency has accredited ServPro of Elks Grove/Itasca...Read more about ServPro of Elks Grove/Itasca/Roselle/Palatine/Rolling Meadows
ServPro of Elks Grove/Itasca/Roselle/Palatine/Rolling Meadows, based in Elk Grove Village, is an HVAC company that was founded in 2000. They offer gas appliance connection, water line installation and more. The United States Environmental Protection Agency has accredited ServPro of Elks Grove/Itasca...Read more about ServPro of Elks Grove/Itasca/Roselle/Palatine/Rolling Meadows
Porch Pro Headshot Lawson's Degree of Comfort LLC
Furnace Repair
Serves Lake Zurich, Illinois
Started business in 1990. Specializing in furnace and A/C replacement. License and Bonded Life workmanship warranty on any installation
Started business in 1990. Specializing in furnace and A/C replacement. License and Bonded Life workmanship warranty on any installation

Latest projects near Lake Zurich

Recent projects booked on Porch
Lake Zurich 60047
Furnace Repair
Start Date
Within a month
Furnace fuel source
I'm not sure
Furnace problems
humidifier leak
When problems started
I'm not sure
Furnace age
I'm not sure
Long Grove 60047
Furnace Repair
Start Date
Within 48 hours
Type of project
Repair, maintenance or cleaning
Repair, maintenance or cleaning project
Heating and cooling system repair
Item to repair
Furnace
Furnace fuel source
I'm not sure
Furnace problems
new home owner, house has been sitting for a few years
When problems started
I'm not sure
Furnace age
5-10 years old