Frequently Asked Questions

• Windows 10 or 11 (64-bit)
• 8 GB RAM minimum (16 GB recommended for energy simulation)
• 2 GB available disk space
• Internet connection for license activation and AI features

The desktop application currently supports Windows only. Free online tools are available in any modern browser.

Yes, the software is safe. Click "More info", then "Run anyway" to proceed. This warning disappears as more users install the software.

Download the .zip from the Downloads page. Copy the .dll and .addin files to C:\ProgramData\Autodesk\Revit\Addins\{year}\. Restart Revit. Supports Revit 2022-2025.

The desktop application is Windows-only. The free online calculators work in any browser on any operating system.

Access to the full JΔS Engineering Suite with 1,300+ modules, all three Revit add-ins (Design Suite, Clash Detection, MEP Tools), AI design assistant, and software updates during the license period.

Yes. PsychChart Pro and DuctSizer Pro are completely free. No license, account, or payment required. Browser-based versions are also available.

We are finalizing pricing. Contact us for early access or licensing inquiries.

• ASHRAE 90.1-2022 — Prescriptive, ECB, and Appendix G
• California Title 24-2025 — NRCC/LMCC/NRCI form generation
• IECC 2024 — International Energy Conservation Code
• ASHRAE 62.1 — Ventilation for Acceptable Indoor Air Quality
• UFC/DOD — Unified Facilities Criteria
• IPC, CPC, UPC — Plumbing Codes
• BS/CIBSE & AS/NZS — International standards

Cloud AI providers (Gemini, Claude, OpenAI) with your own API key. Reviews designs, generates equipment schedules, answers ASHRAE questions, and validates calculations. Gemini offers a free tier.

Revit 2022-2025. Three add-ins: Design Suite (load calcs), Clash Detection (hard/soft, real-time monitoring), MEP Tools (tagging, sizing, scheduling).

Yes — Revit (.rvt), IFC, gbXML, and AutoCAD (.dwg) are all supported.

ASHRAE CLTD/CLF method matching EnergyPro methodology. 8,760-hour energy simulation with TMY3/EPW weather data and DOE-2 compatible outputs. ASHRAE Fundamentals psychrometric equations with altitude corrections.

Calculations use published ASHRAE constants. The 1.08 sensible heat factor is altitude-corrected, CLTD corrections use mean temperature, humidity ratio uses 0.621945. Equipment derating follows AHRI 550/590, AHRI 340/360, and ANSI Z21.13.

523 US locations with ASHRAE design conditions. Custom TMY3/EPW weather files can also be loaded.

First launch may take 10-15 seconds. Ensure 8 GB free RAM. Adding the install directory to your antivirus exclusion list can help.

• Verify files are in the correct Addins folder for your Revit version
• Check .NET Framework 4.8 is installed
• Check the Add-Ins tab in Revit for error details
• Restart Revit after installation

Updates are checked automatically once per day. Manual check: Help > Check for App Updates.

Locally on your computer in .mep files. Cloud collaboration syncs to secure servers but your local copy always remains.

Only when you actively use AI features. Context is sent to your chosen provider using your own API key. AI can be disabled in Settings. We do not store your API keys.

Yes. After license activation, the app works fully offline. Only AI and cloud collaboration need internet.