MEET THE OWNERS

Experience Behind Every Report

Manual J Design Studio brings together decades of field experience, software-based design, training, diagnostics, and direct project support.

Paul Wieboldt

Owner, Senior Instructor & HVAC Designer. Licensed Texas HVAC contractor; approved Elite RHVAC instructor; author and trainer for continuing education courses; specialist in load calculations, equipment selection, duct design, ventilation, dehumidification, geothermal design, and testing and balancing.

Chris Wieboldt

HVAC Designer & Field Professional. Master licensed in Texas, Journeyman Contractor licensed in Idaho, NATE certified, and NBI certified in air balancing, combustion analysis, and carbon-monoxide testing, with extensive geothermal experience.

From Local Fieldwork to National Reach

Paul Wieboldt founded Tradesman Heating and Air Conditioning Services in Waco in 1993. In 1999, after installing geothermal systems at the Crawford, Texas ranch home of President and Mrs. George W. Bush, he founded Tradewinds Appropriate Technologies. Manual J Design Studio grew from that foundation of fieldwork, testing, balancing, diagnostics, and system design.

BUILT BY THE TRADES

Built by HVAC Pros for HVAC Pros

We pair software-based design with real human oversight from professionals who understand code inspections, installation deadlines, comfort complaints, and the practical realities of the jobsite.

HVAC Professionals

Decades of installation, service, troubleshooting, supervision, estimating, and system-design experience inform every project.

Manual J, S & D Expertise

Thousands of software-based calculations and practical training across ACCA Manuals J, S, D, T, and P.

Professional Credentials

Texas HVAC contractor licensing plus NCI, NBI, BPI, IGSHPA, NATE, ASHRAE, and approved Elite RHVAC instructor experience.

Reports Built By Experts

From the first 100 reports to more than 10,000 projects, the studio supports residential work across all 50 states.

Permit-Ready

Code-compliant Manual J, S, and D reports are prepared to keep approvals and projects moving.

Live, Human Support

Questions are handled by experienced HVAC professionals—not just a calculator, help article, or chatbot.

WHY MANUAL J DESIGN

Human Expertise. Technical Precision.

Manual J Design Studio pairs intelligent design tools with real human oversight, practical field judgment, responsive support, and documentation built for performance and compliance.

From Frustration to Foundation

Manual J Design Studio was born out of necessity—after years of dealing with unreliable software, inconsistent reports, and permit delays caused by incomplete load calculations. What began as an internal solution for one HVAC contractor’s projects has grown into a national service trusted by builders, architects, technicians, system designers, and homeowners across all 50 states.

Ready to Start Your HVAC Design?

Choose a calculation package, compare available services, or contact the studio for help selecting the right path for your project.

Call Us

Manual J Design Studio provides professional residential HVAC load calculations and system design services nationwide.

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