About Texcellent A/C Service

Where "Custom-Air Service" Is Our Specialty

At Texcellent A/C Service, we believe true comfort isn't achieved by replacing parts — it's engineered through precision, craftsmanship, and integrity.

We specialize in High-Performance HVAC, focusing on the science of how air moves, how moisture behaves, and how the structure itself impacts comfort and efficiency. Every system we design or service is evaluated as part of a larger whole — the home, the occupants, and the environment it serves.

Our philosophy is simple: Test, don’t guess. By combining advanced diagnostics, building science, and proven design principles, we deliver HVAC systems that perform as they were meant to — efficiently, quietly, and reliably. Whether it’s airflow verification with the TrueFlow Grid, blower door and duct leakage testing, or full Manual J /D /S /T design, Texcellent ensures every installation and service meets measurable standards of performance.

We are a proud UA Local 211 Union Company, committed to continuous training, safety, and the highest level of professionalism in the industry. We have BPI-, NCI-, NATE-, NCCER-, and EPA- certified technicians within our fold, and we bring that depth of expertise to every home and business we serve across the Greater Houston and Gulf Coast region.

Our PEACE Initiative

At Texcellent A/C Service, we believe confidence in your comfort should come from more than a promise. It should come from how we communicate, how we evaluate your concerns, and the care we put into our work.

Our PEACE Initiative brings together five core values that guide our service:

Professionalism ~ We treat you, your property, and your time with respect. Honest communication, clear explanations, and accountability are central to how we do business.

Expertise ~ We combine ongoing education, field experience, and an understanding of HVAC and building science to recommend solutions suited to your home or business.

Accuracy ~ We don't guess, we test. Relevant measurements, documented findings, and careful evaluation guide our recommendations rather than assumptions or one-size-fits-all answers.

Craftsmanship ~ We take pride in the details, from thoughtful design and careful installation to thorough repairs and serviceability. Quality workmanship matters beyond what you can see.

Efficiency ~ We focus on real-world performance, not just equipment ratings. Our goal is effective comfort and moisture control without unnecessary energy use, while respecting your time and investment. Efficiency means working thoughtfully, not rushing or cutting corners.

Together, these values shape how we listen, investigate, explain, and deliver our work. Whether you need a repair, a replacement, or help understanding an ongoing comfort problem, our goal is to give you clear information and confidence in your next steps.

Texcellent gives you PEACE.

MEET THE FOUNDER
Terry McWilliams — “Texcellent Terry”

Faith, Family, and the Pursuit of BetterHVAC

Terry McWilliams, Founder of Texcellent Heating & Cooling LLC

Terry McWilliams, founder and owner of Texcellent Heating & Cooling LLC, built this company on a simple but powerful belief: Do it right, or don’t do it at all.

A lifelong Texan, Union Journeyman, and proud husband and father, Terry’s journey reflects a deep commitment to craftsmanship, honesty, and service with purpose.

From early hands-on fieldwork to advanced certification in building science, Terry saw first-hand how the HVAC industry often overlooked the why behind system performance. He decided to build something different — a company that doesn’t just swap parts or chase symptoms, but tests, diagnoses, and designs true comfort solutions based on data and precision.

Building a Legacy of Professionalism and Performance

Under Terry’s leadership, Texcellent has become known across the Gulf Coast for its uncompromising attention to detail, scientific approach, and customer-first integrity. A proud UA Local 211 contractor, Terry ensures that every technician carries the same pride in their work that defines the best of Texas tradesmanship.

He holds multiple national certifications, including:

BPI Building Analyst Professional – Whole-Building Performance
BPI Certified – Blower Door, Infiltration, and Duct Leakage Testing
NCI Certified – Residential Air Balancing & Duct Optimization
NATE Certified – Heat Pump, A/C, Air Distribution, & Light Commercial Refrigeration Installation and Service
OSHA & NCCER Certified – Workplace Safety and Craft Standards

Terry is also an advocate for manual-based design, utilizing ConduitTech, TrueFlow Grid testing, and MeasureQuick analytics to ensure every Texcellent system performs exactly as designed.

Putting PEACE into Practice

The PEACE Initiative reflects Terry’s belief that technology should support skilled craftsmanship, not replace it. These five values guide Texcellent’s approach to customer communication, diagnostic testing, thoughtful recommendations, and quality workmanship.

“Our goal isn’t just to install equipment — it’s to deliver a higher standard of comfort, air quality, and integrity. Every decision we make should reflect care for the home or business, respect for the trade, and gratitude for the people who trust us.” — Terry McWilliams

Texcellent Heating & Cooling Installation Team

Beyond the Business

When he’s not in the field or mentoring technicians, Terry invests in his local community through church, trade advocacy, and youth mentorship. He’s an active supporter of multiple, local Chambers of Commerce, a champion of vocational education at San Jacinto College, local high school technical programs & the UA Local 211 apprenticeship program, and a proud sponsor of local Texas athletes and charitable initiatives promoting skilled trades and family values.

Grounded in faith, family, and purpose, Terry McWilliams continues to shape Texcellent not just as a service company, but as a movement for BetterHVAC — where science, service, and sincerity meet.

“Proudly Local. Proudly Texan. Proudly American.”
Terry McWilliams, Founder & Owner, Texcellent Heating & Cooling LLC