Ancient thermal wisdom, reengineered for modern construction.
A NEW FOUNDATION
A New Foundation for Sustainable Human Shelter
Patented technology engineered to reduce heating and cooling costs to a small fraction of conventional systems.
Hurricane-resilient homes that are stronger, healthier, lower-maintenance, and built to last for generations.
Affordable, resilient, and energy-efficient—the next evolution toward sustainable human shelter.
THE CHALLENGE AND THE RESPONSE
When adding more insulation stops paying off,
activate the structure.
01 THE PROBLEM
Rising Energy Costs and the Limits of Insulation
- 01
Energy costs are rising as global demand grows and natural resources decline.
- 02
Traditional insulation has reached a hard limit—extra inches no longer yield economic returns.
- 03
Conventional systems operate at 110–120°F because they heat through a limited surface area.
SMALL SURFACE110–120°F
VSLARGE SURFACE65–75°F
02 THE RESPONSE
Lower Temperature. Higher Efficiency.
TWT turns the walls and floors into the heating and cooling surface.
Operate at just 65–75°F.
Operating closer to room temperature reduces energy loss and improves performance.
HOW IT WORKS
Heat moves through water.
The building stores it.
The room receives it.
Thermal Wall Technology uses hydronic tubing embedded within the concrete walls and floor to move thermal energy through the structure. The concrete absorbs and stores that energy, while its large interior surfaces gradually exchange it with the occupied space.
MOVE
Water carries thermal energy through embedded tubing.
STORE
The concrete structure absorbs and holds that energy.
RELEASE
Large interior surfaces gradually exchange energy with the room.
MICHAEL SANDEFUR · INVENTORTHE STORY BEHIND TWT
From a Question to a Breakthrough
Mike and April Sandefur began asking why we insulate buildings when so much heat is already inside the concrete. Their family-led approach activates the building itself rather than adding more insulation.
“Read the full storyThe question was never whether concrete could store heat. The question was whether a building could be designed to use that ability deliberately.
— Michael Sandefur
POTENTIAL BENEFITS
Better for People.
Better for the Planet.
Better for the Future.
Explore all benefits Energy & Grid Flexibility
- Lower energy costs
- Operate at lower temperatures
- Draw energy during off-peak hours
- Adapt to dynamic energy pricing
Comfort
- Even, consistent temperatures
- Quieter and more comfortable
- Healthier indoor environments
- Low-temperature radiant comfort
Resilience & Durability
- Hurricane and disaster resilient
- Stronger structural performance
- Lower maintenance and long life
- Built to last for generations
Renewable Integration
- Works seamlessly with solar
- Improves system performance
- Stores energy for when it is needed
- Supports a sustainable future
BUILT ON INVENTION. SUPPORTED BY ANALYSIS.
Patented Technology
Protected by patents covering the integrated assembly.
Founder-Developed
Invented by Michael Sandefur and developed over nearly a decade.
Independently Analyzed
University analysis examined the core TWT wall principle.