About Us

Looking for reliable heating and AC contractors? Work with a team that has over five decades of experience. Call Comfort- Air Engineering and Primo Plumbing, Inc at (210) 494-1691 for immediate service.


The Legacy of Comfort-Air Engineering, Primo Plumbing, and Freund Enterprises Inc

For over six decades, Comfort-Air Engineering, Primo Plumbing, and Freund Enterprises have been at the forefront of delivering exceptional air conditioning, plumbing, and mechanical services in San Antonio, TX, and beyond. Founded by mechanical engineers Robert and John Freund in 1964, the company was born out of a shared vision to design and construct air conditioning systems for those in need of indoor cooling solutions.

Drawing on their mechanical engineering expertise from The University of Texas at Austin, the Freund brothers dedicated themselves to perfecting their craft and revolutionizing the industry. Their commitment to delivering amazing service quickly earned them a reputation for unparalleled workmanship and personalized attention. With each passing year, Comfort-Air Engineering established itself as a trusted partner for residential and commercial customers seeking reliable and efficient air conditioning systems. In 2001, the second generation of the Freund family assumed leadership, embracing the responsibility of carrying the torch of excellence. This pivotal moment marked a period of growth and expansion for the company. Recognizing the need for comprehensive solutions, Gen2 acquired a local plumbing company, giving rise to Primo Plumbing, Inc. The addition of plumbing services allowed Comfort-Air Engineering and Primo Plumbing to offer a holistic approach to their customers, ensuring their comfort and satisfaction in every aspect of their home or business.

Not content to rest on their past successes, the family’s entrepreneurial spirit propelled them forward. Later that year, Freund Enterprises, Inc was established, catering to the commercial and industrial sectors in South Texas. This strategic move showcased their adaptability and commitment to meeting the diverse needs of their expanding customer base. As the third generation prepares to assume the helm in 2024, the family’s unwavering dedication to their core values remains the bedrock of their success. Their commitment to fostering a family environment, hiring self-motivated employees, cultivating a team-oriented approach, embracing grit and tenacity, and protecting their hard-earned reputation has set them apart in the industry.

Throughout their illustrious history, Comfort-Air Engineering and Primo Plumbing have strived to evolve with the times while maintaining their unwavering commitment to customer satisfaction. By blending timeless values with modern innovations, they ensure their services resonate with loyal customers, new and old. Join us as we celebrate our upcoming 60th anniversary, a testament to the trust and loyalty bestowed upon us by our valued customers. As we enter this new chapter, we invite you to experience the warmth of our family-oriented approach, backed by six decades of expertise and unwavering commitment. Whether you require air conditioning, plumbing, or mechanical services, Comfort-Air Engineering, Primo Plumbing, and Freund Enterprises are here to exceed your expectations and create lasting comfort for generations to come. Welcome to the Comfort-Air Engineering and Primo Plumbing family, where our core values drive everything we do.

Engineering your Comfort for Life!

Upfront Pricing: Know what you’ll pay before any work begins. This eliminates unpleasant surprises on your part!

Free Estimates Available: Get a free estimate on new system replacements, whether for heating, AC, or indoor air quality. This is a no-obligation estimate.

100% Satisfaction Guaranteed: We make every effort to provide you with the results you need. If you are not completely satisfied with our service, we will do everything possible to remedy the situation.

Over 50 Years in Business: We are an experienced team of indoor comfort specialists. No matter your problem, we’ve got a solution for you. After all, we’ve had over half a century to perfect our craft!

5-Star Rated Company: Your neighbors trust us as their go-to AC experts. We are proud to be an Angie’s List Super Service Award winner eight years in a row.

Family Owned & Operated: Our staff may number more than 200, but we operate with good old fashioned values. Every customer is treated to the personal attention they deserve. When you work with us, you’re part of the family!

Call Comfort- Air Engineering and Primo Plumbing, Inc today at (210) 494-1691 to schedule your next HVAC service in San Antonio, TX. Whether you need repair, replacement, or annual maintenance, you can expect quality craftsmanship from start to finish.



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financing available

  • Buy Now – Pay Over Time
  • convenient monthly payments
  • Quick Credit Decisions


  • Bi-annual/planned maintenance
  • Priority Service Call and Scheduling
  • Discounts on Parts & Labor

Why Choose Us

Engineering your comfort for life
  1. Excellent Customer Service & Experience
  2. High and Known Reputation - 5-Star Reviews
  3. Full Transparency - Upfront Pricing and Satisfaction Guarantee

At Our Company, customer satisfaction is our number one priority. Our highly regarded reputation, backed by five-star reviews, stands as a testament to our outstanding service. Plus, you can rest easy knowing you'll always be kept in the loop and have access to upfront, transparent pricing along with our satisfaction guarantee.