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1812 W Griffin Parkway, Suite B, Mission, TX 78572

(956) 955-6340


In Sullivan City, TX it gets hot. To combat the intense heat and humidity, a well-working AC device is a must. The worst thing a home or business owner can face is turning on the unit and not hearing a peep. What do you do? There are a lot of options for AC services in Sullivan City. Save yourself time, energy, and stress by going straight to the experts at Frontier Air Conditioning.

We’re the HVAC Experts for Sullivan City, TX

Frontier Air Conditioning prides itself on being the only contractor to employ NATE-certified technicians. We are also the only business to win the Carrier President’s Award five times in a row. How do we receive all of these accolades of excellence? Education, training, expertise, and determination. Another key aspect is putting our customers’ satisfaction first. We are a family-owned business. You are a part of our network of friends and neighbors. If something isn’t right with your service date, we want to hear it. We offer a 100% money-back guarantee backed by the Carrier Corporation to ensure our customers never are unsatisfied after a job is done.

Quality Service from a Reliable Team

Offering an extensive list of HVAC options such as traditional duct units, mini-splits, heat pumps, and VRF systems, there is something for everyone. Browse our services such as ductwork cleaning, repair, and replacement. We additionally offer products to target poor indoor air quality or assist in reducing energy bills. No matter your goals or expectations, at Frontier Air Conditioning we exceed them and then some.


AC Service, Furnace Repair, HVAC Near Me & Heating Installation in Sullivan City, TX

Heating Installation in Sullivan City, TX | AC Service

AC ServiceHVAC Near MeFurnace RepairHeating Installation ∴ Sullivan City, TX

Our Guiding Principles

The action of helping or doing work for someone. “At Frontier we have the passion to serve others above and beyond their expectations.”


The quality of being honest and having strong moral principles; moral uprightness. “In a world of compromises, our integrity stands firm.”


To admire (someone or something) deeply, as a result of their abilities, qualities, or achievements. “We treat everyone with dignity and respect while remaining consistent and humble.”


The quality of being trusted and believed in. “We build trust on credibility; and our credibility is built on truth and action.”

What people are saying
Customer Reviews

I have been a customer for awhile now and there’s a reason for that. Thank you for taking care of my 3 A.C. / heater systems. Justin came to do maintenance today and he did a great job. Appreciate everyone’s help..begins with Susan and her friendliness to Jay and Victor whom are also very friendly and helpful. Thank you to all!

Anita R

Called for service and the tech was at my door in about an hour! Victor was very professional and explained his processes, repairs and suggestions thoroughly. He got our unit up and running in no time! I will definitely stick with Frontier for any future services.

Anna C

Justin was on time and very informative. Fixed the problem in less than 2 hours. Thank you Justin. Called on Friday afternoon and was there first thing Saturday. Replaced the fan motor and now we are cool again.

Barbara Y

Great service and the owner is very knowledgeable. He took time to answer any question I had. The technicians were very polite and professional. I would definitely recommend Frontier to anyone.

Oscar M

Every team member at Frontier were fantastic! They were patient and answered all questions and concerns leading up to the day of install. For the install, the crew arrived on time and finished on time as promised. The install crew were professional, courteous and left the job spotless. Absolute professionalism from begonia to end. Thank you!

Matthew B

I have had great service with Frontier AC. My AC is running smoothly and my anti microbial system is working great. Rigo came out today and service my AC today and was friendly and professional. Thanks Frontier.

Carol P

Rigo did a great job for me. One of my own repairs blew a fuse within my air conditioner. Rigo figured out the problem, replaced the fuse, and explained everything to me so that I don’t make the same mistake again. I’m very impressed with his knowledge and friendly nature.

Brian G

Very, very happy with Frontier services, our a/c unit went oit all of a sudden and we were needing to replace the entire unit, and not only did they give us a great price and customer service but they wen out of their way to send out technicians on a Saturday to provide immediate service. Technicians were great and very informative on the unit and any questions I asked. So thank you Frontier for your services.

Layoz M

I was very pleased with my experience with Frontier Air Conditioning. From the first phone call after my old AC failed until my new AC was installed everyone were friendly and professional. I recommend them for your AC and heating needs.

Keith T

We have always had excellent service from Frontier. They always arrive within time window. Their technicians are very knowledgeable, efficient and clean up after themselves. Robert was great about explaining everything he had done and suggested additional service that should be performed.

Bob L

Love this company got a whole new system with them works amazing. And if you need any assistance for service, question etc. They go above and beyond to provide fast quality service. Highly recommend Frontier.

Reynaldo B

Justin Siguenza of Frontier AC just left my house after providing bi-annual services. He is a very professional tech and I was also impressed with his friendliness. I hope to see him again in six months.


Very good job Rigo the tech did. Very thorough and professional attitude. Will use their services whenever I need them again. Excellent service. Another satisfied customer. Keep up the good job.

Jay T



Rio Grande Valley Proud

(956) 955-6340

Sullivan City, TX