Ventilated Floors + Active Thermal Energy Storage

The Floor Can Do More Than Support the School.

Termobuild integrates air distribution with the concrete floor system, turning the structure already required for the project into actively managed thermal energy storage.

Store thermal energy Move fresh air Reduce peak HVAC demand Improve comfort
Same structure. Different strategy.
A Different Way to Think About the Floor

The building already needs structure, ventilation, heating and cooling.

Termobuild changes how those systems work together. Cast-in-place or hollow-core concrete floor/ceilings become part of the heating, cooling and ventilation strategy.

Structure The concrete floor performs the structural role already required by the building.
Air Distribution Air moves through designed pathways within the floor system before entering occupied spaces.
Active Thermal Storage The concrete absorbs, stores and releases heating or cooling energy over time.
This is Active Thermal Energy Storage built into the architecture. Instead of adding a separate storage tank, Termobuild uses the thermal capacity of the concrete already being constructed.
Look Inside the Building

It starts with the floor already in the school.

At the building scale, conventional HVAC and ventilation equipment connect to a secondary air-distribution network integrated into the concrete floor system.

In classrooms, air passes through the embedded ductwork in the concrete before entering the occupied space. That interaction allows the concrete mass to participate in both air distribution and thermal energy management.

The important distinction: this is not simply a radiant floor and it is not a separate thermal-storage tank. The building's own concrete mass becomes part of an actively managed energy strategy.
Elementary school diagram showing Termobuild main duct and in-slab air distribution through hollow-core concrete floors

Elementary school Termobuild system illustrating main air distribution, secondary in-slab distribution, hollow-core concrete slabs and classroom air delivery.

From Building Scale to Classroom Scale

Now look inside a single classroom.

The whole-building diagram shows where the air goes. The visualization below shows what happens when that air interacts with the concrete floor.

Active Thermal Energy Storage

One floor. Two operating modes.

Select a mode to see how air moves through the ventilated floor and how the concrete becomes part of the building's heating and cooling strategy.

Termobuild ventilated concrete floor operating in cooling mode
Cooling Mode

Charge the school before the cooling load arrives.

Cooler air passes through the slab, removing heat from the concrete and creating stored cooling capacity that can help carry the building through occupied periods.

1. Charge Cooler air is moved through the concrete floor.
2. Store The concrete mass absorbs and retains the cooling effect.
3. Occupy Students, lighting, equipment and solar gain begin adding heat to the school.
4. Carry the Load The cooler structure absorbs heat and reduces the amount of immediate mechanical cooling required.
What Is Actually Happening?

The floor becomes part of the energy system.

Rather than conditioning the room only at the moment a heating or cooling load occurs, Termobuild allows the building to manage thermal energy over time.

1

Move Air

Air is routed through designed pathways in the ventilated floor.

2

Transfer Energy

Airflow exchanges thermal energy directly with the concrete.

3

Store It

The concrete holds heating or cooling capacity for later use.

4

Release It

Large floor and ceiling surfaces help stabilize conditions as loads change.

5

Reduce the Peak

The structure carries part of the load, reducing dependence on peak mechanical capacity.

Reactive vs. Rechargeable

Don't wait for the load and then chase it.

Conventional HVAC is generally sized and controlled to respond when building loads occur. Active thermal storage gives the project another option: prepare the building before those loads arrive.

Conventional Building

The structure and HVAC system largely perform separate jobs.

  • Load develops
  • Room temperature changes
  • Mechanical system responds
  • Peak HVAC capacity carries the load
  • Concrete remains largely unmanaged thermal mass

Termobuild Rechargeable Building

Structure, ventilation, HVAC and controls work as one coordinated thermal strategy.

  • Anticipate upcoming conditions
  • Charge the structure
  • Store heating or cooling capacity
  • Let the building carry part of the load
  • Reduce dependence on peak mechanical response
Why It Matters

The real value isn't the floor. It's what the floor allows the project to change.

Once the building itself begins carrying part of the thermal load, the mechanical and energy strategy can be reconsidered at the whole-building level.

Peak HVAC Capacity

Stored energy can reduce the mechanical capacity required at peak conditions.

Air Distribution

The floor can perform part of the air-distribution function normally handled by branch ductwork.

Electrical Peaks

Thermal loads can be shifted across time instead of being served only when they occur.

Thermal Stability

Active thermal mass and large surfaces help create a more stable indoor environment.

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Fresh Air Strategy

Ventilation becomes part of the thermal strategy rather than a separate function.

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Building Economics

Less infrastructure and better operating performance can improve first-cost and long-term economics.

Proven in Schools

What happens when the strategy is applied across an entire school?

Termobuild has been applied across millions of square feet of occupied buildings, including K–12 schools in both heating- and cooling-dominated climates.

18+ Years of installed Termobuild project experience
3.2M+ SF of completed building applications
40–50% HVAC capacity reduction achieved on applicable projects
9.7% total project capital-cost reduction on the South Carolina K–12 program

Performance and financial outcomes vary by building type, climate, design, utility structure and project-specific conditions.

A Better Infrastructure Question

The question isn't whether your building needs floors.

You're already building them. The question is what else they can do.

Will those floors remain a dormant structure for the life of the building — or become part of the school's heating, cooling, ventilation and energy strategy?

Use the structure to do more.

Evaluate Your Project

Before sizing the HVAC system, ask what the building itself can carry.

Termobuild works with owners, architects and engineers to evaluate whether active thermal energy storage can reduce infrastructure, improve performance and strengthen project economics.