Sustainable design and energy efficiency

Integrated Design and Environmental Sustainability Certification

Our service offers coordinated support for the integrative design of a sustainable building. We provide consultancy to designers in various disciplines (architecture, systems, structures, landscaping) in order to identify solutions that allow for the construction of a sustainable building in compliance with CAM, DNSH regulations, and LEED protocol requirements.

Integrated Energy Design

To achieve energy efficiency in a building-system, it’s crucial not to stop at formal project verifications but to implement solutions throughout the building’s lifespan. We develop, in collaboration with the client’s work teams, integrated energy qualified projects. This involves overseeing the development of the works within the construction management, up to the verification of actual performance during operation. In this context, we conduct diagnostic evaluations and modeling using dedicated software to identify envelope and system solutions with renewable energy source integrations that best suit the specific case.

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Acoustic Design and Predictive Assessments

Acoustic comfort is a crucial aspect influencing personal well-being. Achieving acoustic comfort goals involves assessing whether the acoustic environment is suitable for the building’s intended use, evaluating the acoustic impact generated by new constructions on existing buildings and activities in the area, and meticulous interior and building element design to maximize the acoustic performance of the building and its spaces.

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Feasibility studies for high-performance energy systems

The design of high-performance energy buildings, whether for renovations or new constructions, should begin with a thorough feasibility study to guide subsequent design phases correctly. In this context, we draft feasibility studies in collaboration with other stakeholders involved in the design, working closely with the client and leveraging our analytical tools and highly specialized knowledge.

Energy diagnosis

For existing buildings undergoing energy retrofitting, the process starts with a study of their weaknesses and potentials, analyzing possible interventions to mitigate the former and maximize the latter. This is achieved through tailored energy diagnostics for each specific case and required depth, in accordance with the UNI CEI EN 16247 standard and coordinated by certified Energy Management Experts (EGE).

Verification of Compliance with Minimum Environmental Criteria (CAM)

All public projects are subject to verification of compliance with the Minimum Environmental Criteria (CAM) in accordance with the Ministerial Decree of October 11, 2017 (soon to be replaced by the Decree of June 23, 2022). This service aims to support design teams in the analysis of all criteria specified by the regulation and identify design solutions and materials capable of achieving them. Verifications are conducted for all criteria relevant to the type of intervention, considering the limitations of applicability and pertinent exemptions.

Life Cycle Assessment (LCA) Analysis

The Life Cycle Assessment (LCA) is a recognized methodology for evaluating the environmental footprint of a building throughout its entire life cycle: from raw material production to transportation, construction and maintenance phases, and ultimately to the end-of-life stage with dismantling and potential material recovery. This analysis is now acknowledged and used in major environmental sustainability protocols (LEED, BREEAM, etc.), contributing to earning points for certification. The analyses are conducted in accordance with EN 15804 and ISO 14040/44 standards using validated software equipped with a certified database.

On-site Consulting

On-site consulting is a service that supports construction companies and designers during the construction phase, aiming to achieve the objectives set during the design phase and/or meet legal requirements. The construction phase significantly impacts the attainment of expected performances. The service includes, in addition to design support, periodic site visits and potential measurements during construction.

Energy certification, accounting and eco-incentives

Energy Performance Certification

The energy performance of buildings, certified by the EPC (Energy Performance Certificate), is increasingly influencing property values. Additionally, it’s important to note that the EPC is required by current national legislation to formalize real estate transactions or lease agreements. It is also necessary to access various incentives for redevelopment projects. To provide a comprehensive service in the field of building energy, we prepare EPCs for both existing and new buildings, following current legislative standards and using certified software.

Calculation of Heating Expense Allocation

Occupants play a key role in reducing energy consumption. However, in condominium contexts with centralized heating systems, temperature regulation and metering systems alone are not enough. It is necessary to have an appropriate method for allocating expenses. Regarding this subject, the legislator has intervened several times, leaving the client free to adopt the most suitable expense allocation method for each case. In this context we develop a methodology for allocating expenses that is most suitable for individual cases to reward virtuous behaviors and incentivize redevelopment projects.

Widespread energy monitoring and energy inventory

Distributed energy monitoring and energy cadastre are crucial within the scope of energy planning. It’s essential to monitor energy consumption across various users and relate them to reference standard values (benchmarks) to guide energy redevelopment actions and incentive policies accurately. To streamline the implementation of these initiatives, we design tools for analyzing consumption. employing energy monitoring systems that, when properly coordinated, enable public entities and property managers to plan strategic directions.

Projects for energy metering systems

Energy metering is the tool that not only ensures compliance with legislative constraints for buildings with multiple users but also allows for the management and control of energy efficiency conditions during the operation of buildings. To achieve these objectives, we design customized solutions for metering real energy consumption, both directly and indirectly, and ensure their commissioning and correct operation, even for systems that have already been implemented.

Energy signature

Energy signature is a highly effective tool for evaluating the actual energy performance of a building system, especially in winter climate control. It permits the study of actual energy consumption, eliminating the influence of climatic variables or other factors, providing an independent assessment of real consumption. In this context, we develop dedicated energy signature methodologies for specific applications, enabling our clients to make informed and strategic choices.

Technical Documentation for Accessing Incentives and Eco-Tax Deductions

The reduction of energy consumption in construction is a national and European priority. For over 15 years, energy redevelopment interventions have been eligible for a variety of incentives. While incentives in this sector are numerous and of significant interest, it’s also necessary to understand their limitations and opportunities to maximize their positive effects. In this context, we support both public and private entities in selecting the most suitable tools and preparing the technical documentation required to access incentive programs.

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Quality of the internal environment

Comfort Analysis

Indoor environmental comfort involves various aspects: natural lighting, thermal-hygrometric well-being, and acoustic performance. This service aims to analyze, both in existing buildings and new constructions, comfort from all these perspectives and identify solutions to enhance it. The analyses are also conducted for the purpose of verifying compliance with normative limits, such as calculating the average daylight factor (FLDm), calculating comfort indexes PMV and PPD, and assessing acoustic performance and descriptors.

Environmental Monitoring for Conservation or Comfort Purposes

The activity involves continuous monitoring of microclimatic parameters (temperature, air humidity, CO2, etc.) within the spaces you intend to supervise. The data undergoes processing and transmission through a monitoring report, adhering to established technical standards, accompanied by analyses and comments outlining the trends observed in the monitored data. Both the standard report model and the emission frequency can be agreed upon. In case there is no monitoring system in place, the activity may also include the installation of the monitoring system.

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Take a breath

Take a breath and live more serenely with the awareness of being in a healthy environment. It’s our monitoring and diagnostic service aimed at identifying and resolving indoor environmental pollution issues. Take a breath aligns with Goal 3.9 of the United Nations General Assembly resolution “Transforming our World: the 2030 Agenda for Sustainable Development.”

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Dynamic modeling

CFD Simulations (Computational Fluid Dynamics)

Our service strives to study and verify the fluid-dynamic behavior of complex ventilation and air conditioning systems. The goal is to identify potential thermal comfort issues and assess the effectiveness of these systems in terms of treating all spaces and removing pollutants. Analyses are conducted using Design Builder and Vento AEC computational software. Vento AEC is particularly suitable for studying complex volumes and varying boundary conditions.

Dynamic Thermal Simulations

Our service focuses on studying the energy behavior of a building and its systems in dynamic regimes, creating a simulation model that closely mirrors real-world behavior. This approach allows for a more accurate verification of a building’s energy performance. Analyses are conducted using Design Builder software, which integrates the Energy Plus calculation engine. The energy modeling follows ASHRAE 90.1/2010 appendix G standards, contributing to the pursuit of LEED certification.

Thermal Comfort Simulations

Our service focuses on the dynamic simulation of thermal comfort within air-conditioned spaces. Analyses are conducted using Design Builder software, allowing for the determination of Predicted Mean Vote (PMV) distribution and Predicted Percentage of Dissatisfied (PPD) for the analyzed space.

Daylight Simulations

Our service focuses on the dynamic study of natural light behavior within a building. It includes the calculation of the average Daylight Factor, along with the calculation of Daylight Autonomy (sDA300), indicating the percentage/frequency of hours during the usage profile where natural light exceeds the 300 lux target, and Annual Sunlight Exposure (ASE1000,250), representing the fraction of the space where direct sunlight exceeds 1000 lux for more than 250 hours throughout the year.

Simulation of Room Acoustic Response

For accurate acoustic design of environments, it is crucial to understand the acoustic response of the space in its initial state and simulate the acoustic response of various adoptable solutions to choose the most suitable one. With the use of specialized software at our disposal, we can create precise models that allow the study of noise propagation within spaces, providing simplified outputs for result interpretation and comparison of various simulated solutions.

Commissioning, checks and tests

Commissioning Authority

Our service strives to provide certified Commissioning Authority activities for building systems. Commissioning is a systematic process which main purpose is verifying the proper interaction and functioning of the systems within a building, ensuring they operate according to the design intent and can deliver the performance required by the client. Through both basic and advanced Commissioning services, our proposal contributes to achieving LEED certification.


Our service is designed to support the LEED certification process by an accredited professional throughout all project development phases, from the initial concept to detailed design and project implementation. This includes interfacing with the project team, contractors, and the Green Building Certification Institute (GBCI), the entity responsible for issuing the final certification.

Functional Testing of Systems

This service aims to verify the proper functioning of systems, with a particular focus on HVAC systems. The service can be performed to support the technical-administrative testing of a public and/or private project according to the procedures outlined in current regulations. Onleco, through its network of collaborations with companies in the systems maintenance sector, can provide an integrated service of engineering and assistance on systems, offering reliable and certified measurements.

TAB – Testing, Adjusting, and Balancing

Our Testing, Adjusting, and Balancing (TAB) service is carried out by specialized technicians on building system components. They adjust operating parameters, calibrations, or rectify incorrect installations. In addition to our engineers’ expertise in the design, verification, and testing of systems, Onleco, through its network of collaborations with maintenance companies, provides an integrated service of engineering and assistance on systems, ensuring reliable and certified measurements.

Thermographic surveys and measurements

Energy efficiency is intended as comfort, and whether for existing buildings or the assessment of new constructions, it relies on measuring the behavior of the building system in operational conditions. We conduct specific measurements such as infrared thermography, on-site thermal transmittance measurements, air velocity, temperature, humidity, illuminance, and other physical and chemical parameters. Our services in this field are facilitated by a stable collaboration with Allemano Metrology, a specialized company based in Turin, focused on metrology.

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Energy Optimization and System Regulation

In both existing and older systems, as well as in newer ones, there are often opportunities for optimization and improvement at various levels. That’s why we provide support to system operators to reduce energy consumption and/or enhance occupant comfort. We employ various investigation techniques selected based on specific cases, such as infrared thermography, continuous monitoring of fluid temperatures, and occupant comfort conditions.

Acoustic Testing

Experimental verification and testing are activities specifically required by regulations, especially concerning passive acoustic requirements. This involves conducting, once the construction is completed, sound level measurements to determine the in-situ acoustic insulation of building components, the noise generated by continuous and discontinuous operation of systems, or the acoustic parameters characterizing listening and acoustic comfort. Experimental testing surveys may also be requested for evaluating noise levels in the external environment.