Enertia Homes
Enertia Homes is a Youngsville, North Carolina company presenting itself as the current manufacturer and marketer of Enertia® homes — the solid Southern Yellow Pine, double-envelope, passive-solar building system that Michael Sykes patented in 1985 (U.S. 4,621,614) and refined through the zeolitic seed-crystal patent granted in 2005 (U.S. 6,933,016). The Duncan family — Andrew (a first-generation Sykes employee) and Michelle (CEO/Owner) with sons Zachary (VP/Architectural Designer) and Jacob (Marketing Director) — operate the ongoing business out of the same 715 Park Ave, Youngsville NC plant where Sykes' Enertia Building Systems, Inc. still trades under its own name. The site publishes 9 stock home designs from $147K (Nova) to $560K (Legacy) plus three ADUs, cites the 2007 TIME Best Inventions listing, and sells through kits shipped from Youngsville with 2–4 week owner-directed assembly.
About
Enertia Homes carries forward one of the more genuinely inventive American passive-solar building systems of the past forty years — the solid Southern Yellow Pine, double-envelope home Michael Sykes patented in 1985 (U.S. 4,621,614) and refined through the zeolitic-seed-crystal moisture-conditioning patent in 2005 (U.S. 6,933,016). The system uses the timber mass itself as thermal storage; a south-facing sunspace and continuous convective loop condition the interior with radically less HVAC than a conventional envelope. Sykes' Enertia design was named to TIME magazine's Best Inventions of 2007 list and featured on Discovery's Modern Marvels the same year. The Duncan family took over as the marketing and manufacturing team in 2022 — Andrew Duncan had been Sykes' first employee in the early 1980s, and his wife Michelle and sons Zachary and Jacob now run day-to-day operations from the same 715 Park Ave plant in Youngsville, North Carolina where the system has been produced since Sykes founded Enertia Building Systems, Inc.
Photo Gallery
Key Features
Enertia Homes markets 9 stock floor plans plus 3 accessory-dwelling designs, with fixed kit pricing published on the site. Total finished-home cost typically runs about 3× the kit price per the FAQ. The system's foundational patents were granted in 1985 (envelope design) and 2005 (moisture-conditioning zeolitic timber), both to Michael Sykes personally — the Duncan family took over marketing/manufacturing operations in October 2022 without a public license or assignment on file at USPTO.
1982
Enertia® System First Built
2007
TIME Best Invention
9
Stock Home Designs
3
ADU Designs
$147K
Entry Kit (Nova)
2-4 wk
Owner Assembly Window
Why Choose Us
Most 'zero-energy' offerings today are envelope-heavy stick-frame builds relying on very tight construction, mechanical ventilation, and high-performance glazing. Enertia's premise is the opposite — the timber envelope IS the thermal battery, and the building form (double envelope + sunspace + convective loop) does the conditioning. That approach has been continuously in the field since the early 1980s. What Enertia Homes offers today is the same ~40-year-old patented system, produced from the same North Carolina plant, packaged as an owner-buildable kit at fixed pricing tiers.
Solid Timber, Not Sticks and Foam
Enertia homes use solid Southern Yellow Pine (grown in the region within about 500 miles of the plant) as both structure and thermal mass. The wood species matters — Sykes selected it specifically for its thermal storage properties and its regional availability. No foam board is required in the wall system.
Double-Envelope + Sunspace Passive Design
The building form itself does the conditioning: south-facing sunspace, continuous convective air loop between an inner and outer envelope, and thermal mass in the timber. Documented in Sykes' 1985 patent (U.S. 4,621,614) and refined in the 2005 zeolitic-seed-crystal patent (U.S. 6,933,016).
Transparent Kit Pricing — $147K to $560K
Enertia publishes fixed kit prices for 9 home designs plus 3 ADUs — from Nova ($147K entry) to Legacy ($560K). The FAQ states total home cost typically runs about 3× the kit price and delivery/assembly is 2–4 weeks after material arrival, giving prospective owner-builders unusual pricing transparency.
TIME Best Inventions of 2007
The Enertia® building system was named to TIME magazine's Best Inventions list in 2007 and profiled on Discovery Channel's Modern Marvels the same year. Sykes' NPR Science Friday and Popular Science coverage also from that era document the system's public technical validation.
Family-Run Continuation of a First-Generation Team
Andrew Duncan was Michael Sykes' first employee in the early 1980s. His wife Michelle now serves as CEO/Owner, sons Zachary (NC State ME, 2011) and Jacob run operations and marketing. The lineage — one of the original team members' family carrying the system forward — is real and traceable.
Services List
Home Kits (9 Designs)
- Legacy — $560K kit (flagship)
- Terra — $350K kit
- Aquarius — $336K kit (featured in Dwell)
- Horizon — $309K kit
- Meridian — $305K kit
- Cascade II — $302K kit
- Equinox — $290K kit
- Cascade — $189K kit
- Nova — $147K kit (entry)
ADUs & Support
- Carriage House ADU — $81K kit (576 sf)
- The Voyager ADU — $50K kit (910 sf)
- The Retreat ADU — $26.5K kit (320 sf)
- Kit shipping from Youngsville NC plant
- 2–4 week owner-builder assembly guidance
- Design consultation and customization
Contact Information
Service Area
Plant & Manufacturing
715 Park Ave Youngsville, NC 27596
Ships To
Coverage
Ships Enertia® home kits nationally from the Youngsville, NC plant. Verified testimonials on the site come from Central Illinois (Aquarius), Southern Colorado (Arcadia), Virginia (Brandywine), and North Carolina (Custom, Equinox). Delivery timing is stated at 3–12 months from order to shipment.
Credentials
TIME Best Inventions of 2007 — Enertia® Building System
The Enertia® solar-timber building system was named to TIME magazine's Best Inventions list in 2007. Award attaches to the invention (originally Michael Sykes) rather than to the current company iteration. Also featured on Discovery Channel's Modern Marvels (2007), NPR's Science Friday (2007), and Popular Science.
Zachary Duncan — B.S. Mechanical Engineering, NC State (2011)
Vice President and Architectural Designer/Manufacturing Engineer/Operations Manager. NC State University mechanical engineering degree (2011) verifiable via his LinkedIn profile. Prior sales-engineering roles at Yardi and Investor Management Services before joining Enertia in September 2023.
USPTO Patent 4,621,614 — 'Building System' (Sykes, 1985)
Original double-envelope, sunspace-and-convective-loop building system patent granted to Marvin E. Sykes Jr. (Michael Sykes) in 1986. USPTO records show 2003 assignment to 'Enertia Licensing Corporation' and same-day reassignment to ASA Holding SA (Romania). No downstream assignment or license to any Duncan-controlled entity appears in the USPTO assignment database. Patent term has expired.
USPTO Patent 6,933,016 — 'Autoclaved-Aerated Timber' (Sykes, 2005)
Zeolitic-seed-crystal moisture-conditioning patent granted to Marvin E. Sykes Jr. in 2005. USPTO assignment database shows no license or assignment out of Sykes personally. Sykes and his separate company (Enertia Building Systems, Inc.) remain the owners of record.
Platinum Member
Healthy Building Alliance
Professional ·