A high-performance building envelope, such as one created with biocomposites from the TecnoCanapa Bioedilizia® System, changes the way heating and cooling systems should be designed. Homes that lose very little heat do not need oversized systems: the right choice becomes a fast-responding, targeted system sized to the building’s actual energy demand.
Why the envelope comes before the building services
In buildings constructed with natural materials that combine high mass and high insulation, such as Biomattone® blocks or hemp-fibre insulation systems, energy consumption for heating and cooling is very low: sustainably built homes meeting these construction standards can have indicative annual energy costs of between €300 and €400. When the envelope loses little heat, the system only needs to operate for short periods: a few minutes or at most half an hour to bring the space back to the desired temperature. Designing the system before optimising the envelope almost always leads to oversized systems that are inefficient in relation to the building’s actual needs.
Air-based systems: VMC combined with a heat pump
For air-based systems, the most efficient solution is not conventional air conditioning but Controlled Mechanical Ventilation (VMC) combined with a heat pump. In a well-insulated building, this combination reaches the desired temperature quickly while also providing the air exchange required for good indoor environmental quality, without having to open windows during periods of peak heat or cold. Responsive on/off controls managed by thermostats further improve overall efficiency.
Next-generation radiant systems: floor, ceiling and wall
Traditional radiant systems with 4–6 cm screeds require several hours to charge and discharge the thermal mass: a slow response that is poorly suited to an envelope that already loses very little heat. Next-generation low-profile radiant systems overcome this limitation. Underfloor panels with reduced screed thickness (minimum 30 mm above the pipe), and especially ceiling radiant systems with boards as thin as 12 mm, provide much more responsive heat delivery and a more natural perception of radiant heat, similar to sunlight. Next-generation valves fitted with heads that detect the supply-water temperature modulate energy at every stage, from conduction to radiation, avoiding waste.
Choosing the right system for a hemp-lime building
There is no single system that is always best: the choice depends on the characteristics of the envelope and the habits of the building’s occupants. In a building made with the TecnoCanapa Bioedilizia® System, where thermal phase shift and humidity management are already handled by hemp-lime biocomposites, the building-services system has the simpler task of addressing only the remaining temperature peaks rather than compensating for shortcomings in the envelope. In addition to reducing running costs, this approach makes it possible to use smart monitoring systems that further optimise consumption according to actual living requirements.
Frequently asked questions about building services and sustainable construction
Is an air-based or water-based system better in a sustainably built home?
Both can work well when the envelope performs effectively: VMC with a heat pump also provides air exchange, while next-generation radiant systems deliver heat more responsively than traditional versions.
Does an envelope such as Biomattone® make a heating system unnecessary?
No, but it greatly reduces its workload and operating times, with direct effects on running costs and system sizing.
Do low-profile radiant systems also work in renovation projects?
Yes. Systems with reduced screed thickness or ceiling solutions are also designed for projects where available space is limited.
To learn more about the thermal performance of the TecnoCanapa Bioedilizia® System, consult the technical data sheets available on the website, or contact us for a project-specific assessment.
