Thermist Add-in

Thermist Add-in is a Revit MEP add-in that replaces manual routing with automatic, clash-avoiding routes generated in seconds. It works across all MEP disciplines — ducts, pipes, conduit, and cable tray — and includes two core tools: A to B and Coil Connect.

A to B — Universal Routing Tool

A to B lets you route from any element to any point or connector with automatic clash avoidance, including clashes in linked models. Select your starting element, click your destination, and the tool intelligently routes around obstacles using a custom pathfinding algorithm. It works for everything from short diffuser connections to long pipe rack extensions.

A to B also supports tap routing for diffusers and VAVs, with options for flex duct connections and configurable minimum straight runs at specific connectors. It handles standard Revit families as well as ITM fabrication parts, making it useful across a wide range of project types and LOD levels.

Coil Connect — Automated Coil Piping

Coil Connect models clash-free branch piping from coils to mains in seconds. The tool automatically identifies the nearest piping mains, determines optimal routing, and connects your coils with valving — eliminating one of the most tedious manual tasks in hydronic system modeling. A manual mode is also available for users who want to pick their own supply and return mains rather than relying on automatic selection.

Valving arrangements are fully configurable, and the tool respects the same clash avoidance logic as A to B.

Built for Privacy and Control

Thermist operates strictly locally — no usage data ever leaves your machine. There is no telemetry, no cloud dependency, and no account required beyond the Autodesk App Store download. Your models stay yours.

Getting Started

Thermist is available on the Autodesk App Store with a free one-month trial — no credit card required. A full demo with timestamps is available at thermist.com/demos.