Michiana’s Trusted Partner for Industrial Heating Solutions

Based in La Porte, Indiana, Thornton & Associates helps mechanical contractors and engineers across Indiana design and source heating systems for factories, warehouses, and industrial facilities. We offer expert design support, dependable equipment, and six-month quote validity to help you stay on time and within budget. Contact us today for a quote!

Webster Combustion boiler system connected to ductwork in industrial building
40+ Years of Experience

Decades of Experience.
Built for Contractors.

For over 40 years, L.D. Thornton & Associates has supported mechanical contractors and engineers with industrial heating solutions that work. Based in La Porte, Indiana, we specialize in helping factories, warehouses, and commercial facilities across Indiana stay warm, efficient, and on budget. As a family-owned company, we take pride in providing expert design support, responsive service, and reliable equipment because your projects depend on it.

Built for Performance

Industrial Heating Services

At L.D Thornton & Associates Inc., we provide a comprehensive range of services tailored to meet the needs of industrial, commercial and institutional clients.

HVAC Equipment Sourcing

Reliable industrial heating and ventilation products from top manufacturers, trusted by contractors across commercial and industrial sectors.

Ventilation System Design

Custom-engineered ventilation systems designed for optimal air movement, indoor air quality, and regulatory compliance in demanding environments.

System Integration & Project Support

Comprehensive system integration, from design to installation, ensuring all components work together efficiently, with ongoing contractor support.

Custom Heating Solutions

Tailored heating system designs to meet the specific needs of industrial builds, expansions, and retrofits, with a focus on efficiency and budget.

Technical Consulting & Coordination

Expert design consultation and project management to streamline system installs and minimize costly delays or mismatches.

Contractor Training & Product Education

Ongoing education and support to help contractors install and maintain systems with confidence, featuring up-to-date manufacturer guidance.

Our Commitment to Contractors

Why Contractors Rely on LD Thornton

We help mechanical contractors, engineers, and design-build teams deliver industrial heating systems that work efficiently, reliably, and cost-effectively. No guesswork, just results backed by real data and proven equipment.

Trusted Industrial Heating Equipment

We source proven, high-performing systems built for reliability and long-term performance.

Energy-Efficient System Design

Reduce fuel use and meet energy codes with smart, performance-focused designs.

Lower Operating Costs by Design

Proper application and controls cut downtime, reduce service calls, and extend system life.

Transparent ROI You Can Trust

No greenwashing, just real data and honest quotes you can plan around.

Expert Guidance From Design to Install

From layout to install, we help avoid costly mismatches and keep projects moving.
Thermo-Cycler heating equipment installed inside industrial facility
Large industrial building under construction with Genie lift equipment inside
Industries We Serve

Powering Progress in Every Industry

We deliver customized solutions designed to support businesses across a wide range of industries from healthcare and finance to manufacturing and logistics.

  • Healthcare

  • Finance & Banking

  • Retail & eCommerce

  • Logistics & Supply Chain

  • Schools

  • Automotive

  • Hospitality & Travel

  • Real Estate & Construction

  • Steel Mills

  • Manufacturing

Testimonials

What Our Clients Say

From responsive service to reliable equipment, our clients count on us to keep their projects moving. Hear it directly from the teams we support.

Excellent Service, been with them for 5 years and they have gone above and beyond to help. The service is great and they are very responsive to the YMCA needs.

Ava M.
CEO – NovaEdge Solutions

L.D. Thornton & Associates website is well organized and informative, clearly showcasing their expertise in energy efficient HVAC solutions and commitment to real world performance.

Liam C.
PM- BrightPeak Innovations

Who We Work With

Industry Leading Manufacturers

We partner with top HVAC and combustion system manufacturers to provide equipment that performs and brands our clients know they can trust.

AbsolutAire logo with green triangle design and company name
Burnham Commercial Boilers logo with metallic design
Webster Combustion logo with blue flame graphic and tagline A Selas Heat Technology Company
Bryan Boilers company logo in orange and white on black background
Thermo-Cycler logo with red and blue flame graphic
Thermal Solutions logo with sun graphic and tagline Innovative Equipment for Hot Water Systems
Hamilton Engineering logo with globe graphic and tagline Innovative Hot Water Solutions
Solaronics logo with red text
Don’t Know Where to Start?

We’re Here to Help.

Reach out with questions about our products, services, or capabilities. A member of our team will follow up with you directly.

Talk to a Heating System Expert

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Stay Connected With L.D. Thornton & Associates

Follow us on LinkedIn and Facebook for heating system insights, contractor tips, and a behind-the-scenes look at our team in action. From new equipment installs to everyday jobsite moments, see how LD Thornton helps contractors get the job done right.

Thornton & Associates staff at community golf outing event
Group touring manufacturing facility with industrial equipment
Close-up view of industrial boiler internal tubing at trade show
Thornton & Associates team members enjoying a company dinner event

Need Reliable Industrial Heating Solutions for Your Next Project?

Whether you’re sourcing HVAC equipment, planning a new mechanical room, or need expert support with heating system design, LD Thornton helps contractors and engineers deliver results. Our team provides trusted industrial products, design consulting, and accurate quotes tailored to your project’s specs and timeline.