April 28th 2026

Climate-Led Design: Your Top Questions Answered

By the time many project teams access climate data, critical design decisions have already been made. That delay often leads to redesign, underperforming buildings, and growing difficulty complying with sustainability requirements, such as LEED, AIA 2030 or RIBA Sustainable Outcomes.

In a recent webinar, our consultants highlighted how IESVE can help you transform complex weather datasets into clear, actionable guidance in seconds; and compare potential weather conditions parametrically. 

The questions from design and engineering teams worldwide revealed clear, consistent themes. Here’s what people are really asking.

Are weather files available for just the UK or US, or are they globally available?

IES provides weather files for locations globally, to enable accurate simulation for projects anywhere in the world. These are available for use in our IESVE, iCD, iSCAN and iVN products. You can find our full range of weather files here.

What is an AMY weather file?

AMY stands for Actual Meteorological Year. The data in this file type is based off actual measured weather data for a historical year at a given location. Instead of representing typical conditions, it reflects what actually happened during that year. This is a good weather file to use for calibration or climate resilience studies.

AMY weather files from Athenium can be purchased via IESVE here.

Can you use future weather files to generate the Climate Assessment Report?

Future weather files, TMY files and AMY files can all be used within the Climate Assessment Report in IESVE. Future weather files will be most beneficial during resiliency studies, by enabling assessment of building performance under projected climate conditions. TMY files are most suited for baseline studies, whereas AMY files are useful for validation, stress-testing, or referencing recent weather events.

Can the reports generated within the Climate Assessment Report feature be shared with people not using IESVE?

Yes - the reports produced are in HTML format to allow both users and non-users to review climate insights. With interactive charts and dynamic explanations, the Climate Assessment Report makes these insights accessible to clients, planners, sustainability leads and decision makers.  

Does the parametric simulation run a full annual simulation for each combination of parameters?

The Parametric Simulation feature can run a complete annual dynamic simulation for every parameter combination, producing like-for-like results across energy, carbon, comfort, loads and other key metrics.

Depending on the study requirements, simulations can be configured at different levels of resolution, allowing teams to balance speed and detail. Earlystage studies may use simplified or reducedresolution simulations (1 week per month, or per season) to rapidly explore a wide design space, while laterstage or decisioncritical scenarios can be evaluated using full 8760hour dynamic simulations for maximum accuracy.

Can sensitivity analysis be carried out with the Parametric Simulation feature?

Yes - IESVE’s Parametric Simulation enables sensitivity analysis by running full simulations across controlled variations of key inputs, revealing which parameters have the greatest influence on building performance. It supports singleparameter variation, multiparameter sensitivity, and rangebased testing.

As a result, Parametric Simulation is a powerful tool for feasibility studies and for justifying earlystage design decisions with confidence.

What version of IESVE do I need to access the features highlighted in these sessions?

Both the Climate Assessment Report and the latest updates to the Parametric Simulation feature are available within IESVE 2025 Feature Pack 2. Download or upgrade now today.



Want to go deeper?

If you’d like to see how these principles are applied in practice, you can: