About Sigler Heat & Air

A Three-Generation Legacy of HVAC Excellence

Sigler Heat & Air began as Southwest Weathermakers in Tulsa in the mid-1930s before being purchased by Russ Sigler in the 1940s. In 1962, Operations Manager Orval Gilleland acquired the company, beginning a family legacy that continues to this day. Now in its third generation of family management, Sigler Heat & Air is a name you can trust in the Tulsa metro area.

For over 70 years, we’ve maintained our singular focus on HVAC excellence. Unlike companies that spread their expertise across multiple services, we’ve dedicated ourselves to mastering one craft: heating and cooling solutions for Tulsa homes and businesses.

Our Approach: Technical Mastery with Integrity

What makes Sigler different isn’t just our longevity—it’s our fundamentally different approach to HVAC service:
While many companies operate on a sales-driven model, we’ve deliberately chosen a different path. We don’t employ salespeople. Every Sigler representative who visits your home or business is a highly trained technician focused on solving problems, not meeting sales quotas.

This technical-first approach has established our reputation for being able to repair systems others claim need replacement. It’s why other contractors often call us for help with their most challenging jobs.

Our Values

For three generations, our business has been guided by core principles that haven’t wavered since 1947:

Integrity in Every Interaction

We believe in honest assessments and transparent pricing. Our recommendations are always based on what’s right for your system, not what’s most profitable for us.

Technical Excellence

We’re committed to ongoing education and technical mastery. Our technicians continuously expand their knowledge to stay ahead of industry developments while maintaining expertise in legacy systems.

Customer-First Service

We recognize the importance of listening first. Every service call begins with understanding your specific needs and concerns before we recommend solutions.

Attention to Detail

Getting it right the first time isn’t just a goal—it’s our standard. We approach every job with meticulous care because we understand that the smallest details often make the biggest difference in system performance.

The Sigler Standard™

Expert Assessment

Honest Solutions

Proven Reliability

Our Team

Led by the Gilleland family, our team brings together decades of combined HVAC experience. Our technicians undergo rigorous training and mentorship to ensure they meet the exacting standards that have defined our company for generations.

Unlike other companies where you might meet a salesperson first and a technician later, at Sigler, you’ll always work directly with the technical experts who will diagnose and solve your HVAC challenges.

Our Commitment to Tulsa

As a locally owned and operated business, we’ve been part of Tulsa’s growth and development for more than seven decades. We’ve worked with thousands of customers across multiple generations, building lasting relationships based on trust and exceptional service.

We take pride in our deep roots in the community and our role in keeping Tulsa comfortable through every season. Our knowledge of local architecture, climate challenges, and building practices gives us a unique advantage in serving the specific needs of homes and businesses in our area.

Experience the Difference

After more than 70 years and thousands of customers served, we remain committed to the fundamentals that have defined Sigler Heat & Air since the beginning: technical expertise delivered with honesty and integrity.

We invite you to experience the difference that comes from working with true HVAC specialists who value your trust above all else.