Rethink the load before you size the equipment.
What if the building's concrete structure could help manage heating and cooling peaks? Evaluate an air-driven thermal storage strategy against your conventional HVAC design—with clear performance, controls and delivery requirements.
Don't start by downsizing equipment. Start by changing the load profile.
Conventional mechanical design often begins with the loads that equipment must meet at the building's most demanding hours. Those peaks influence capacity, distribution, electrical infrastructure and installed cost.
Termobuild integrates air pathways into concrete floors and uses coordinated HVAC controls to charge and discharge the structure's thermal mass. The building becomes part of the heating and cooling strategy—not a replacement for the mechanical system.
The engineering question is whether that integration can reliably reshape the load profile while maintaining occupied-space comfort, ventilation and controllability.
Same structure. Different strategy. Air-driven thermal storage in cast-in-place or hollow-core concrete can work with conventional HVAC. No separate thermal-storage tank plant is required.
What must the engineering analysis establish?
A credible alternative design must answer more than whether concrete stores energy. It must demonstrate how the integrated system performs as a building.
What drives the actual peak?
Establish hourly heating and cooling loads, occupancy schedules, internal gains, ventilation requirements, climate conditions and coincident equipment peaks. Compare the conventional baseline with the proposed thermal charging and discharge strategy.
How much usable thermal capacity is available?
Evaluate the concrete geometry, active floor area, duct configuration, airflow, charging windows and allowable temperature range. Distinguish theoretical stored energy from deliverable heating or cooling under design conditions.
Can comfort and ventilation be maintained?
Check occupied-zone temperatures, radiant conditions, setpoint response, fresh-air delivery and humidity control. The storage strategy must complement—not displace—required ventilation and occupant comfort functions.
How do controls behave in real operation?
Define charging logic, discharge priorities, HVAC coordination, schedules, sensors, operator overrides and recovery after atypical conditions. Specify what happens when storage is depleted or loads exceed forecast.
What changes in construction and commissioning?
Coordinate structural design, embedded air pathways, duct interfaces, balancing, access, trade responsibilities and verification. Review constructability and schedule implications with the actual delivery team.
What is the net system outcome?
Compare required HVAC capacity, daytime electrical demand, fan energy, controls, maintenance and total installed scope. A smaller nominal equipment selection alone does not establish a better whole-building outcome.
Performance has to survive design, delivery and operation.
Prove the load strategy.
Compare conventional and integrated alternatives with explicit assumptions for weather, occupancy, thermal storage availability and design-day recovery. Document sensitivities and operating limits.
Define the system boundary.
Coordinate concrete, ductwork, HVAC, controls and commissioning responsibilities. Confirm air distribution, access, structural constraints and interface details before specifications harden.
Make performance measurable.
Establish trend points, functional tests, baseline metrics and an operating review plan. Include occupant comfort, equipment response and performance under representative peak conditions.
Evaluate the approach. Then evaluate the project.
Existing applications and technical materials help frame the design questions. They do not replace a project-specific engineering model or commissioning requirements.
How the building stores and releases energy
Review the air-driven floor strategy and its relationship to conventional HVAC and building controls.
Explore how it works ↗Ontario school case study
Examine reported school energy and operating performance, while distinguishing observed project outcomes from predicted results for a new design.
Review the Ontario school ↗Capacity, energy and demand outcomes depend on climate, building loads, structural configuration, system design, controls and operating schedules. Any published project result should be interpreted in its original context.
Build the comparison before committing to the design.
The goal is not to ask an engineering team to accept a predetermined capacity reduction. It is to give the team a credible alternative to model, price, coordinate and verify.
For design-build and ESCO delivery, this also creates a clearer basis for defining responsibilities and measurable outcomes.
- Define the conventional baselineLoads, HVAC selections, ventilation, comfort criteria, controls, peak demand and installed scope.
- Model integrated thermal storageConcrete configuration, air paths, charge/discharge cycles, occupied hours, design days and controls.
- Review failure and recovery modesPeak conditions, depleted storage, operator overrides, humidity control and backup HVAC capability.
- Price, commission and verifyWhole-system scope, constructability, controls integration, acceptance testing and operating trend data.
What would your team need to confirm?
The important questions are not objections to work around. They are the basis of a responsible design evaluation.
Does this replace conventional HVAC?
No. The concrete provides thermal storage that works with conventional HVAC and coordinated controls. HVAC remains responsible for delivering required heating, cooling, ventilation and appropriate backup capacity.
Can equipment be sized smaller from day one?
Potentially, but only where project-specific load and storage analysis supports it. The capacity decision must account for peak and extended conditions, thermal recovery, ventilation, comfort and control sequences.
Is the system hydronic?
The Termobuild approach described here is air-driven. Conditioned air moves through integrated floor ductwork; the concrete serves as the thermal storage medium. It should not be depicted or specified as a water-pipe radiant slab.
Can occupants still adjust their temperature?
Occupant setpoints and operator controls remain part of the design. The control strategy must define how user adjustments, HVAC response and stored thermal energy interact, including when conditions change unexpectedly.
How does it affect ventilation and indoor air quality?
Required outdoor-air ventilation and humidity control must be maintained through the mechanical design. Thermal storage does not eliminate those requirements; the air distribution and controls strategy must address them explicitly.
Does it work for retrofits and design-build projects?
It may be considered for both, subject to the existing or proposed structural system, available floor access, duct routing, schedule and mechanical integration. Feasibility should be established before assuming a retrofit or delivery model is suitable.
What would an ESCO need for performance commitments?
A documented baseline, defined scope and control sequences, an agreed measurement approach, commissioning criteria and explicit assumptions about occupancy, weather, operating schedules and maintenance responsibilities.
Before equipment capacity is fixed, test the load strategy.
Bring the preliminary load model, mechanical concept, floor configuration or performance criteria. Determine whether an integrated thermal storage alternative merits detailed design analysis.
An engineering-led feasibility conversation—not a request to replace your existing design team.