Doug and Karen Garner were married in 1988 and founded Garner Heating & Air Conditioning, Inc. later that same year. Over the years, they built the business on a foundation of hard work, integrity, and a commitment to exceptional service. After decades of dedication to their business and community, Doug and Karen are filled with pride in their family and are now enjoying the opportunity to spend more time with their children and grandchildren.
In 2024, Doug and Karen made the heartfelt decision to sell the business to their long-time employee and trusted friends, Justin and Carol Sheffield. Having worked alongside Doug and Karen for many years, Justin and Carol share the same dedication to quality and customer service that Garner Heating & Air Conditioning, Inc. has always stood for.
Doug and Karen are incredibly thankful for the support of their customers over the years and are confident that the Sheffield family will carry on the legacy of excellence they worked so hard to establish. They are excited to see the business continue to thrive while they enjoy this new chapter in life focused on family and cherished moments together.
Justin Sheffield is the proud owner of Garner Heating & Air Conditioning, Inc., having purchased the business with his wife, Carol, in early 2025. Justin is deeply committed to continuing the legacy that Doug and Karen Garner built—one founded on integrity, exceptional service, and a dedication to the community. With over 25 years of management experience across various industries, Justin brings a wealth of knowledge and leadership to the business. His passion for transparent, reliable, and affordable service ensures that the values Garner Heating & Air Conditioning has upheld for decades remain at the heart of everything the company does.
Justin enjoys spending quality time with his wife, Carol, and their adult daughter at their home in the Wimberley area. In his free time, he loves being outdoors, collecting, and exploring the natural beauty of the Texas Hill Country. Justin’s dedication to both family and community reflects the same values that have been at the core of Garner Heating & Air Conditioning since its founding. He is excited to lead the company into the future while staying true to its proud history.
Ryan Peterson is our Operations Manager. He ensures that we are always providing the very best quality Service and Installations. He is NATE certified in 4 areas of our trade and is also NCI Airflow Certified! Ryan, his wife and two children live in Seguin. He is very passionate about our trade and is always looking for ways to improve us through training!
Brittany Cupp is our Office Manager. She oversees scheduling and the ordering of parts among her many other job duties. Her diligence in these areas is vital to getting our customers taken care of as soon as possible. Brittany has lived in the Austin area since 2016. She is an avid hiker and in cooler months she spends much of her time outdoors.
Marissa Gloria is our Customer Service Representative (CSR). She will be answering our phones and ensuring our customers get the best possible service! Marissa is also in charge of maintaining our Maintenance Club! Marissa lives in San Marcos with her husband and two daughters.
Max Bethke is one of our Project Managers. He has been with us since 2005! Over his time with Garner, he has worked in almost every position with the company as he worked his way up to Project Manager. He is very skilled in finding the best solution for our clients in need of a new AC system in residential and small commercial applications. Max, his wife, son and two stepdaughters live in San Marcos where his family has a long history. Max is NATE certified.
Eli Dover Will be seen is our Lead Service Technician. You will see him on repair calls as well as Maintenance visits. Eli lives in Buda and is eager to help our customers with their comfort systems! Eli is passionate about our trade and has invested heavily in his tools and training! Eli is NATE certified.
Matt Fleischauer is one of our Service Technicians. Matt is a great asset to our team and one of our most requested Technicians! He is great at maintaining and repairing residential A/C and Heating systems. He and his wife live here in Kyle. Matt is working towards acquiring his NATE certification.
Omar Hernandez Omar graduated from Canyon High School in 2020. After graduation he jumped right into HVAC by attending and completing his certification from Lawson Institute in 2021. He then worked through his apprenticeship with Garner Heating and Air and is now a Service Technician. He is a fast learner with an aptitude for fixing HVAC systems. He is fluent in two languages and in his off time he loves supporting his favorite club Barcelona FC. Omar loves helping his clients get their systems working and takes pride in a job well done.
Chey Simpson has been a Certified HVAC technician since 2020. He has called the Texas Hill Country home since 1986. He is very passionate about HVAC and in his spare time, he is an avid golfer.
Ethan Deaver is an Installation Team Leader. He consistently gets great 5-Star Reviews from our clients. His attention to detail and mechanical aptitude enables him to install new systems with the highest degree of accuracy. Ethan lives in Maxwell with his wife and son. Ethan is also a very capable, Certified Service Technician!
Angel Tinoco will be seen on most of our system replacements and new construction projects. Angel joined us in 2021 and has proven to be a great asset to our Installation Team. He has grown quickly with our company and is working towards becoming an Installation Team Leader. In Angel’s free time, he enjoys watching combat sports, training in boxing, and playing guitar.
Jacob Barty has been in the HVAC trade since 2016. He is experienced in completing system maintenance, running service calls, and installing new systems. Jacob enjoys working on cars in his free time. He and his wife currently live in New Braunfels.
