
Can I Install a New Furnace and Still Use My Pre-Existing Ducts?
The ductwork in your home is probably extensive, running through walls, under floors, and through crawlspaces. If you need to replace your current furnace because it has broken down, or perhaps has lost too much efficiency, you won’t want to go through the extra work of replacing your current ductwork system to accommodate the new furnace. People often wonder if new ductwork is a requirement for a furnace installation.
The answer is: “Usually not.” We’ll look into how this works. But for a solid answer, you’ll need to talk to an HVAC technician who can look over your house and your current furnace. Call Goettl Air Conditioning & Plumbing today and learn about what you’ll need for a new furnace installation.
You won’t need to replace your ductwork if…
You are installing a furnace similar to your current one. Your new furnace will likely have a higher efficiency rating than your old one (advances in technology have made furnaces more energy efficient in general) and include more features, but it can use the same ducts without any complications. Your installers may need to make some adjustments at the connectors, but nothing more extensive than this.
Even for most high-efficiency furnaces, you won’t need to replace any of the ductwork. Have the installers perform duct testing along the ventilation system to spot leaks or other places where the ducts might lose heat. This will give the installers an idea of how well the ductwork will handle a high-efficiency furnace. If you have taken good care of the ductwork over the years, you can expect few problems.
You may need ductwork replacement if…
The ductwork is extremely old and/or in poor shape. If you’ve experienced trouble with leaking ductwork before and have needed numerous sealing and repair jobs done, then you should consider at least having partial ductwork replacement. HVAC installers can perform the same duct testing to find just how leaky the ducts in your home have become. Based on this, they can provide you with an estimate of how much work needs to be done to make sure that your new furnace can live up to its efficiency rating.
Call duct and furnace professionals
At Goettl Good Guys Air Conditioning, we not only provide excellent furnace installation and other heating service options but we are also air quality and energy efficiency specialists. We can combine installing your new furnace with duct testing and repairs so that you’ll know that you will receive the finest possible performance from your new heating system. If you have any concerns about your ductwork and a new furnace, call us today.
Testimonials
What Our Customers Say About Us






This week the HVAC tech, Deano came to do the winter service. I knew my system was old, and Deano was courteous when explaining all the things my system needed. He patiently walked through the options and helped me determine a realistic solution for my home and for my budget! In the end I wound up getting a replacement system, Mike helped walk me through the financing options which were doable for me.
Goettl does a great job! With techs like Deano and Mike they are truly an asset to the company and give me peace of mind for my home.


He was my technician from another company. I’m always happy with his service that’s why I’m following him.
Thank you Colby , you are the best technician I’ve ever had .
I really do appreciate your work!!


He arrived promptly and was very professional.
We are first time customers and from now on we are calling Goettl for all our plumbing needs.
Thank You.



Andrew came in and unclogged the bathroom sink and cleared out the line . We used the Smart Sadie program for it.
Thanks Andrew and Ian and Goettl!








Overall, an awesome tech. I would love for him to be my designated technician for any future service calls for my AC unit. Thank you for a wonderful experience!


I’m very happy with the seamless experience.



Frank did an excellent job at explaining every thing in terms that were understandable to both myself and my wife. This greatly assisted in making the right decision to look at all options on either repair or update/purchase for the future and in the long term, saving money.
Jose Carreon was the tech who was dispatched to look into a problem of a brand new system not working correctly after a new install. Jose was very methodical in his approach and found the actual issue which was not an install issue except the settings of the thermostats which were replaced and installed by Goettl. Jose's complete inspection and patience resolved the problem and he went the extra mile of calling a supervisor for a second opinion. The system is now running as it should!!! Thanks Jose!!


Great communication





Call Goettl and was able to get us on the schedule due to a cancellation they had.
Jef Eusepi our tech was fantastic.
He explained everything and showed us pictures of what he was doing and fixing.
Would definitely recommend this Company and Jef.



I am very thankful for their help today.









Thanks Goettl and more importantly, thanks Blair!





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Update 4/21/25 - Mike did a wonderful job. Made suggestion to keep my system running well for more years to come.
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Update: 12/3/24 - Jacob is great. He fixed the leaking parts on water softener and also checked the water heater to see what can be done with that. He is efficient and very knowledgeable and reviews everything so you understand.
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Update: 7/25/24 - had some more work done today. The folks who come to service, install, etc. are great. They know their job, are very efficient and friendly. Today it was Justin and Luis who were installing a new filter system. Looking forward to not have to change filters every month. Thank you, gentlemen, for all the hard work in the heat.
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They said I needed to replace my a/c. I was given a choice of 5 units. I liked that the 2nd most expensive would balance the temperature in my house. I get full west in my living room in the afternoon. It is always 10 plus degrees hotter on my sofa, than rest of house. So I paid a fortune and it isn't doing what he said it would. They came back and added another vent to my living room. Better, but still not what I was told. I could saved $10k and got the cheaper model. Don't think I have much recourse to get this fixed. The technicians are very good, too bad their salesmen and products are not up to the same standard.






Thank you!!!










Thank you Ian for my maintenance today!
March 2, 2024
Thank you Aaron for my garbage disposal! A big shout out to Mark and Ricky in dispatch for coming through and getting this done in a timely fashion to ensure I was prepared for my company coming to dinner. I love goettl and their service! Proud to be part of club Sadie!
March 2025
Always return back to Goettl because of how well they take of me! Thanks to Judd for installing my new toilet and to Marc for my AC maintenance!
November 2025
Thank you to Gerardo for educating me on hot water heater flushing! Lol. I always appreciate geottl for their customer service and knowledgeable techs!

























A special shout-out goes to Pablo, our technician. He was on time, friendly, and extremely knowledgeable. Pablo took the time to explain everything he was checking, walked me through the condition of each component, and gave helpful tips on how to keep our system running efficiently year-round. His attention to detail and pride in his work really stood out. Because of his professionalism and the overall quality of service, Goettl has definitely earned my trust and future business.
Highly recommend Goettl HVAC—and if you can, ask for Pablo!

I have seen Goettl vans all over town and so I called them.
Got appointment right away and the Technician, Jef Eusepi, took care of our problem.


He was knowledgeable and friendly and was able to flush the tank and get my hot water flowing again. Thanks again...



(Oldest)Jared was great. Got here promptly and fixed it quickly. Lifesaver on a 100+ degree day!

















Mike provided truly exceptional service. From the moment he arrived, it was clear he was extremely knowledgeable; he quickly and confidently diagnosed a very tricky issue that we had with our pipes, explaining everything clearly and answering all of our questions with patience. He also installed our new water heater and did an outstanding job. If you need a plumber who gets the job done right the first time, we highly recommend Mike. Thank you!









Thank you,
Greg Sanches





















This past week our service technician was Andrew Morgan and he is such a friendly, knowledgeable, and skilled technician. He spent time making sure the job was done correctly and he explained it in terms that I could understand. Not only is our unit functioning even better than before, I also gained knowledge of how the system works.













I highly recommend Goettl as this is the second time l've used them in less than a year. (2 seperate issues)... and I highly recommend them..anytime and anyday.
They have exceeded to top any expectations I could have ever had with any company.


Jerry also noticed our water pressure was low after flushing toilet then trying to wash hands in bathroom sink which were so he suggested a new pressure regulator as we have had a new better water conditioning system installed. We now have the best water pressure even when using a shower and kitchen sink faucet at the same time. Also Jerry is a master plumber and we appreciate his knowledge and experience. Will definitely call Goettl again when a plumber is needed.
Ralph & Kathy Lesmeister



Darean Guerra today. He arrived on time and took the time to explain what he was going to do. He was very knowledgeable which helped me trust what he was doing. He left his work area clean. I am very pleased with his work.









The company is installing a tankless heater and the customer service is outstanding.
I recommend Geottl to all!


They made sure my carpet was covered and when they were all through they cleaned up perfectly
I would recommend your company to anyone looking to put in a new air conditioner.
Thank you so much for all you did for me.
Sincerely, June Jones

And I would highly recommend the company and the quality technicians like Jarod.
Jarod is the go to if you want excellent
Customer service and communication for any AC related issues. He is very knowledgeable, personable and trustworthy. I am grateful and satisfied.







They listened to my issue, were very through, checked for leaks, etc. I’ve lived in Lakeway for 30 years, used MANY local plumbers - but Goettl will definitely get all my business moving forward. HIGHLY recommend!
Ty, Wil & Adrian!

Everyone from the Goettl sales representative Christian, Tech / Advisor Josias recommended a HVAC A/C and Heating system replacement. Technicians team Veronica and her partner.

Jeremy Canchola serviced our mini-split today with the usual Goettl efficiency and professionalism.
Highly recommended!



