Downloads

Get the desktop application, Revit add-ins, and user guides. Everything you need to start designing.

Desktop Application

The full JΔS Engineering Suite with 1,300+ engineering modules.

JΔS Engineering Suite v1.2.5

Complete MEP design software for HVAC load calculations, energy compliance, plumbing design, equipment selection, and more. Includes built-in AI design assistant.

Windows 10/11 (64-bit)
~500 MB
v1.2.5 - April 2026

Windows SmartScreen Notice: Because JΔS Engineering Suite is new software, Windows may display a SmartScreen warning on first launch. Click "More info" then "Run anyway" to proceed. The software is safe and digitally distributed.

System Requirements

Windows 10 or 11, 64-bit
8 GB RAM minimum
2 GB available disk space
Internet for activation & AI features

Revit Add-ins

Extend Autodesk Revit with JΔS engineering tools. Supports Revit 2022-2025. Requires .NET Framework 4.8.

JΔS Design Suite for Revit

Full load calculation and energy analysis integration directly within Revit.

  • Import room/space data from Revit models
  • Run HVAC load calculations in-place
  • Energy analysis and compliance checking
  • Export results back to Revit parameters
  • Bidirectional project synchronization
Revit 2022-2025 | .zip Sign In to Download

JΔS Clash Detection for Revit

Automated MEP clash detection and coordination tools for Revit.

  • Multi-discipline clash detection
  • QA/QC automated checking
  • Coordination report generation
  • Clash grouping and prioritization
  • Integration with BIM coordination workflows
Revit 2022-2025 | .zip Sign In to Download

JΔS MEP Tools for Revit

Productivity tools for everyday MEP modeling tasks in Revit.

  • Automated equipment tagging
  • Duct and pipe sizing tools
  • Color-coded system visualization
  • Schedule generation and formatting
  • Batch parameter editing
Revit 2022-2025 | .zip Sign In to Download
Installation: Extract the .zip file and copy the .dll and .addin files to C:\ProgramData\Autodesk\Revit\Addins\{version}\ where {version} is your Revit year (e.g., 2024). Restart Revit after installation.

Standalone Tools

Professional engineering calculators. PsychChart Pro and DuctSizer Pro are free — PlumbingCalc Pro requires a free account.

PsychChart Pro

Interactive psychrometric calculator with ASHRAE-accurate equations. Two-point comparison, air mixing analysis, metric/imperial toggle, and chart export.

  • ASHRAE Fundamentals 2021 psychrometric equations
  • 7 input methods (DB+RH, DB+WB, DB+DP, DB+W, etc.)
  • Two-point comparison with air mixing
  • Imperial and metric unit support
Windows 10/11 | ~25 MB | Free Download

DuctSizer Pro

Professional duct sizing calculator with round, rectangular, and flat oval support. CFM per diffuser calculator with round-to-5 balancing, SMACNA flat oval table, and constrained sizing.

  • Round, rectangular, and SMACNA flat oval sizing
  • CFM per diffuser calculator with round-to-5 balancing
  • Constrained sizing (lock width or height)
  • Darcy-Weisbach with Colebrook-White iteration
Windows 10/11 | ~25 MB | Free Download

PlumbingCalc Pro

Plumbing fixture calculator with Hunter's Curve interpolation. Fixture schedules, water supply sizing, drainage, DHW, gas piping, and storm drainage.

  • IPC 2024, IPC 2021, UPC 2021, CPC 2022 codes
  • 28 fixture types with CWFU/HWFU/WSFU/DFU
  • 8 building presets and Revit JSON import
  • CSV and TXT report export
Windows 10/11 | ~40 MB Sign In to Download
Also available online: Use these tools directly in your browser — no download needed. Psychrometric Chart | Duct Sizer | All Free Tools