Summer comfort is becoming a key requirement in real estate projects. Yet, few projects manage to design it from the outset, simulate it robustly, and then demonstrate it through concrete examples. The gap between hype and operational reality often remains. At Arkoris, we have developed an integrated solution, leveraging the expertise of Arkemep (thermal engineering, STD), Arkenor (environmental project management), and IRICE (certification). The objective is clear: to move from promise to proof, and to integrate summer comfort into a logic of user performance.
Defining the challenge: summer comfort and performance in use
Summer comfort is neither a side effect of the label nor a variable to be adjusted. It is a fully-fledged technical requirement, which implies taking into account:
- the actual thermal inertia of buildings
- the dynamics of sun protection
- ventilation systems (natural, night, mechanical)
- usage patterns
- the microclimatic context of the site
Too often, the issue only emerges during the execution phase. By then, it's too late. This requirement must be integrated from the earliest design phases.
Combining engineering, project management assistance, and certification
With Arkemep, we integrate dynamic thermal simulations (DTS) focused on critical periods (heat waves, long periods of high heat) right from the initial design phase. These simulations allow us to identify weaknesses and guide design choices accordingly.
With Arkenor, we frame the anticipation of actual uses within the environmental assistance mission. Summer comfort is addressed in relation to the needs of future users: occupancy schedules, lifestyles, ventilation strategy, and expectations regarding regulation.
With IRICE, we document and certify expected performance based on tangible indicators: degree-hours of discomfort, rate of exceedance, and overheating time. Certification is not based on generic labels but on contextualized evidence linked to the realities of the project.
Implementation examples
In several projects in dense urban areas, the coordinated implementation of these three approaches has enabled:
- a measured reduction of +3 to +5 °C during heatwave periods compared to regulatory standards
- a ban on the use of active air conditioning in commercial buildings
- complete documentation in the tender documents, integrated into the performance clauses
These results are not intentions: they come from simulated data, cross-referenced with real usage constraints.
Certify less, certify fairly
Summer comfort is not just a line in a marketing brochure. It requires engineering, methodology, and the ability to report.
Rather than adding one label to another, our approach is the opposite: reduce the layers, strengthen the rigor, and bring to light what is truly useful to project owners and users. Fair certification means aligning methodology, evidence, and real impact. No storytelling. No hype.
Conclusion
Between greenwashing and overpromising, there remains room for sensible, concrete, and user-centered approaches. We occupy this space with the tools of the Arkoris group, serving verifiable environmental performance.