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 v1.3.2

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
v1.3.2 - May 2026

How to install: Download Design_Suite.exe and double-click to run the installer. If Windows shows a SmartScreen warning, click More info → Run anyway. The installer places the app under %LOCALAPPDATA%\JSEngineering and creates a Start Menu shortcut — no admin required.

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 5 JΔS ribbon tabs: JS Design Suite (load calcs, compliance), JS MEP Tools (6 panels), JS Productivity (7 task-automation tools), JS Clash Detection, and JS Viewer3D (standalone 3D viewer launcher). Supports Revit 2020-2026. Requires .NET Framework 4.8 (Revit 2020-2024) or .NET 8 (Revit 2025+). All tabs install via the 3 .zip packages below.

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 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 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 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 Download

Viewer3D Pro v1.0 BETA

Standalone real-time 3D viewer for BIM models — Δ-branded chrome, VTK 9 PBR rendering with HDR image-based lighting, WASD fly-through. Inspired by Enscape's workflow.

  • 4 render modes: Realistic / High / Performance / Wireframe
  • WASD + mouse-look fly-through navigation
  • HDR sky probe, screen-space ambient occlusion
  • IFC + glTF + OBJ + STL import (Phase 2)
  • Revit ribbon launcher — one click to view active doc
Windows 10/11 | ~120 MB | 4 GB VRAM recommended Download
Also available online: Use these tools directly in your browser — no download needed. Psychrometric Chart | Duct Sizer | All Free Tools

Edition Tiers

Discipline-specific editions are in final calibration. The current Design Suite EXE ships every module — the upcoming tiers split the same engine into focused, lower-cost editions for firms that only need one practice area.

Discipline-Specific Editions

Same calculation engine, same validated accuracy — just narrowed to one practice area. Perfect for residential HVAC contractors, plumbing-only consultants, energy modelers, and CA-phase teams who don't need the entire 1,300-module suite. See the editions page for the full feature matrix.

Energy Edition

ASHRAE 90.1 + Title 24 + IECC + 8760 simulation + life-cycle cost.

HVAC Edition

ACCA Manual J 8 + ASHRAE Ch. 17/18 + equipment selection + duct & pipe sizing.

Plumbing Edition

IPC / UPC / CPC + DHW + storm + gas + medical gas.

CA Admin Edition

RFI + submittal + punchlist + daily log + field survey + commissioning.

Design Suite Complete

All editions + Revit add-ins + AI assistant. The current Design_Suite.exe above.

View Editions & Feature Matrix Contact for Early Access