
What Are Dual Fuel Systems and How Do They Work?
Heat pumps are one of the best systems available for home comfort on the market today. These systems can either heat or cool a home, and instead of burning fuel to do their job—like furnaces and boilers—they work through the system of heat exchange that moves heat from one place to another using only a modest amount of electricity. Heat pumps are fantastic ways to have year-round comfort in the southwest.
There is one disadvantage that heat pumps have, however, but through the use of a dual fuel system, they can overcome this. For a consultation to see if a heat pump is ideal for your home, either on its own or as a dual fuel system, give Goettl a call. We have many years of experience finding ways to cool and heat homes throughout the southwest.
How dual fuel hybrid systems maintain heat pump efficiency
Here is the main drawback of heat pumps: at extreme low temperatures, they will have trouble with maintaining their heating efficiency. Because a heat pump must remove heat from outside and bring it inside when in heating mode, the lower the outdoor temperature, the less heat is available for it to use. In most cool temperatures, this is not a problem—but when the thermometer drops below the economic balance point (which varies based on humidity), the heat pump will begin to experience troubles.
A dual fuel hybrid system combats this with a smaller backup heater that uses a different fuel source. Most backup heaters are natural gas furnaces, although propane furnaces are also common for homes that lack access to a natural gas pipeline. When the temperature reaches the economic balance point and the heat pump starts to lose efficiency, the backup heater automatically switches on and compensates for the loss of heat. As soon as the temperature rises back above the economic balance point, the backup heater shuts off.
Since heat pumps are known for their energy saving abilities in heating mode, a dual fuel system is an effective way to bump up a heat pump’s performance while only making a small extra sacrifice in costs. The backup system will only need to run occasionally, so it’s a less expensive option than having a full furnace or boiler rather than a heat pump.
Your home may not have the need for a hybrid system to assist the heat pump; to find out, call on the experts at Goettl Air Conditioning & Plumbing.
Testimonials
What Our Customers Say About Us


Update: 26 Aug 2025, Joel Jr. did an outstanding job explaining the plumbing systems and future recommendations. Thx Goettl!
Update: 6 April 2025. Ask for William, Aiden for plumbing and Juan for QC. If that doesn't work their managers , especially Jason , will offer a fair solution. All provided outstanding, experienced and expert services.
Update: 31 Mar 2025. Thanks Will Bloodworth for taking my call and ensuring that we received service...even on your day off!
Update: 20 Mar 2025. Thanks again Tyler L. for the great service!
Update: 21 Dec 224. Outstanding work performed by Richard.
Joseph provided us with excellent service and took the time to answer all of our questions!
UPDATE: Another big shout out to Andrew Arizola. Once again, with expertise and efficiency, Goettl showed up as promised. Andrew diagnosed the repair and resolved all of my sink/faucet/plumbing issues at a reasonable cost. It is always a breath of fresh air to work with fair and honest Plumbers/technicians. Thanks again, we appreciate it.


I especially want to give a shout out to Connor, who did the replacement, he was awesome. He was respectful and cleaned up afterwards. I even commented on how impressed I was that he was able to fit everything needed in a small space.
Overall I would recommend Goettl services especially in an inconvenient situation like mine. They will make you a priority.


Update-9/26/2025-Angel Zamora, Jose Torres, and Jonathan Saucedo are great assets to your team. You couldn't ask for better representatives for your brand. They were efficient and got the job done right. I really appreciate them.
Alex Nelson is the BEST! When I say I thought I was going to die from this extreme heat and Alex came along and saved the day, he did! Im so thankful he is honest and trustworthy! Thanks Goettl!!





Zack and his crew who did the tile work, made it look easy! We can't wait to try it out after the caulking and other stuff set up and dry out!


This appointment was to check that my heater is working properly before winter arrives.





Today the HVAC team came with a coil cleaning and suggested maintenance. Steven and Jonathon were top notch. Courteous, professional and informative. If you want it done right, get Goettl.

Maintenance, I have 3 (three) units, Brandon
Completed the work in a reasonable amount of time, and gave a comprehensive overview
Of conditions , He was very courteous, with good appearance , and was careful of surrounding furniture.
I would rate him, Excellent.




















Given the extent of the work I need to get multiple quotes and some companies insist on expensive trip charges (one up to $500) to have a “specialist” assess before providing a quote for the work.
These guys were timely, transparent and uncomplicated. I appreciate Shane for quickly putting together an estimate before even leaving the house, providing multiple options at various price point and without pressure of upfront commitment.
I would feel confident moving forward with these guys. Thank you Shane!

Edit 07/10/2025: Matthew Lopez was super friendly and did an amazing job checking out our AC system and cleaning it.
Edit 03/15/2025: Dareen Guerra was super friendly and helped us identify what was leaking water super fast
Edit 12/17/2024: Frank McBride was great and fast
Edit 11/11/2024: Jeremy was great and helped us understand what was going on with our HVAC
Miguel was extremely helpful and quick to fix. 10/10 recommend Miguel and goettl

Rudy and Chris came by to check the water heater and they evaluated everything in great details, they were very professional and friendly.
Definitely recommend Goettl for home service.

8/18 update! We appreciate the ability of Goettl to come out ASAP which went from scheduled 9am next day to just 90 min after the call in. We have 2 AC units and the second one lasted 29 years, but it finally needed to go as of yesterday. We had Hunter this time and of course he was prompt, professional, thorough & informative.
6/2025 update: water filter installed - Max is fantastic! We needed some routine maintenance and he most certainly went above and beyond. Will ask for him again - don’t hesitate to ask for Max, or any of these professional, knowledgeable service providers!
Aaron was great. Kind, professional, thorough with work. We trust this company, and they provide quality. Appreciate their approach to service, and their respect for the clients. Recommend Goettl if you want quality work - quality isn’t cheap but it is affordable!

Frank was wonderful and he allowed us the opportunity to evaluate several aspects of our current circumstances with our water heater. Frank was friendly and professional and we look forward to working with him in the future. Thank you, Frank!


I have used Goettl for years. They are not the cheapest, but the work is always quality and the service and technicians top notch.





Kristian was super professional, explained all steps and fixed shower facet in a short time! My call was on Saturday, and wait time was within 1-2 hours; plus, company did not charge ‘emergency’ fees as many other companies do.
Highly recommend!!


I was so impressed I joined the maintenance program, so an additional shout out to Ryan Angle who completed my water heater service and plumbing inspection, same as the others Great Job… Thanks
Had my AC serviced yesterday, another 5⭐️ for Goettl, Brandon Moreno got everything squared away, Happy Summer 😎👍🏼🆒
Just had my winter service completed by Brandon Moreno, as always with Goettl 5⭐️ again, always courteous, friendly and professional. Happy Winter ❄️⛄️😎
Had a valve issue come up and ended up handling the situation myself, however the visit to initially assess and troubleshoot the problem with technician Ryan Angle was another quite pleasant interaction with the Goettl team. Thanks and Happy Holidays ⛄️❄️😎




Lupe was friendly, respectful, and really interested in what I had to say. He worked efficiently and told us of problems when they arose. Really glad he came!
1/2025
Dusty was an absolute pleasure to work with. He was friendly, knowledgeable, and committed to doing the job right. He was training a new tech and even with that added responsibility, his attention to detail was impeccable. I cant believe how great this company is to do business with. Hopefully we get Dusty again next time! Thank you!!
2024 John was absolutely amazing. From introducing the company and its history to walking through every unit. He was friendly and warm and extremely honest. I wish he could be my technician on everything in my house. Thank you John!!

















Nov 22 2024: Seasonal maintanence check and I once again was fortunate to get Jacobi again. He is a well thorough service tech. Everything went smooth and he explained what he saw and did. A+++++
Mar 25 2024: My service tech's name is Jacobi. He is a very knowledable individual. He mentioned he does maintenance and installation. I was due a routine maintenance but for this call my furance wasn't turning on. He diagnosed and explained it was the blower. Very pleased with his work.
Aug 27 2020: Jeremy did a great job.Called when he was heading over. Cleaned out the dripping pan and cleaned out the drain pipe. Wore his mask while he was inside my house.
Great, fast service even on July 4 2018. Tony was my service tech. He diagnosed and got me up and running ASAP.

I highly recommend Goettl Air Conditioning and Plumbing! Shane Smith, their plumbing service technician, provided outstanding service when we needed a new water heater. He arrived promptly, explained all options clearly, and guided us through the process with professionalism and friendliness. Shane's knowledge and patience made our decision-making easy. We're grateful for his help and impressed by Goettl’s efficient, customer-focused approach. Five stars for Shane and Goettl.
Zach Carlisle from Goettl Air Conditioning & Plumbing did an incredible job installing our new water heater. His exceptional professionalism, courtesy, and expertise made the entire process seamless. Zach kept us well-informed, worked efficiently, and left our home spotless. He even took the time to educate us on water shut-off procedures. Zach truly embodies the values of excellent customer service and craftsmanship. Kudos to Goettl for having such a talented and dedicated installer!


Stacy arrived today. He was super knowledgeable and interested in answering our questions (which were abundant). Very friendly and not in any hurry to leave. He took his time to explain what he was doing. He pointed out a dangerous situation with our surge protectors. We had fried wires! We ended up having them replaced right on the spot. We were so impressed with him that we will be requesting him next time we're due for our routine check up. Thank you,
Stacy!
James Jacobson was outstanding with his knowledge and took his time explaining every detail.
Julian and Devin arrived to do the Water Jetting and they were outstanding! I was impressed and I Highly Recommend them.





Thank you,
Greg Sanches

Thank you,
Greg Sanches










Addendum: Furnace inspection on hold until vents can be don; but new Furnace/AC coming in soon.
Round two: Plumbing with Skip Yonker!!
Thank you Skip for making the whole process more understandable! Very informative and got right to work!! He explained and confirmed what Pablo had pointed out originally. New Water heater coming soon.
Round three: Furnace/AC in!!! Thank You Marco and Rafael for coming in extra early to get started! Had work today but they stayed and got everything installed. I honestly felt very comfortable leaving them here to get the job done!
I have recommended you to two friends already!! They will be calling you soon ☺️
Round four: New water heater pending. To be completed Friday!! Super excited!!



She showed up even late in the evening completely focused and energized. Completely knowledgeable and able to provide complete assessments of my system. I want her back every single visit now 🙏🙏🙏.
I highly recommend the Sadie watchdog program!!! 👍👍👍





































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.




Now we have a new flange, installed correctly, and ready for the new toilet!







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!


Hopefully, we will get Jack for our next service call.






