# Overview

Start using VentilatePro in ChatGPT, run reproducible HVAC calculations, review saved project results, or integrate the CLI and MCP server.

Canonical: https://ventilatepro.com/exam/cli/

Documentation version: VentilatePro CLI 0.7.0

## Start with your engineering task

VentilatePro connects HVAC calculations and project records across the web app, ChatGPT, the command line, and other AI clients. Choose the workflow you need.

[01

**Use VentilatePro in ChatGPT**

Connect the sidebar workspace, run calculators, and discuss results.

→](https://ventilatepro.com/exam/cli/chatgpt/)
[02

**Run an HVAC calculation**

Find formulas, units, worked examples, and calculation limits.

→](https://ventilatepro.com/exam/cli/calculations/)
[03

**Review saved project results**

Read room, zone, and AHU schedules with calculation freshness.

→](https://ventilatepro.com/exam/cli/projects/)
[04

**Connect the CLI or an AI agent**

Install the command-line tool or configure an MCP client.

→](https://ventilatepro.com/exam/cli/install/)

## Choose an interface

| Interface | Best for | Account |
| --- | --- | --- |
| ChatGPT workspace | Six calculators, saved project results, engineering prompts | VentilatePro OAuth connection |
| Browser calculator | Psychrometrics, charts, exports | No login |
| CLI | Repeatable offline calculations and project automation | No login for local calculators; token for project work |
| General MCP server | Typed tools for AI agents and guarded project workflows | OAuth remotely; token for local project tools |

The ChatGPT workspace reads saved project values. Its six calculators and read permissions are a focused subset of the general MCP server.

## Try a calculation

Open the [free browser psychrometric calculator](https://ventilatepro.com/tools/psychrometric-calculator/), or install the CLI for a repeatable sensible-load check:

```text
pipx install ventilatepro-cli
ventilatepro calc sensible-load --cfm 5000 --entering-dry-bulb 80 --leaving-dry-bulb 55 --json
```

Expected result: **135,000 Btu/h** of sensible cooling, using 1.08 × 5,000 × (80 − 55). This uses standard-density air. It is a sensible-load check; whole-building loads require the project calculation workflow.

See [air-load formulas and assumptions](https://ventilatepro.com/exam/cli/calculations/#air-loads) or the [installation guide](https://ventilatepro.com/exam/cli/install/).

## Continue with a focused guide

- [CLI installation and upgrades](https://ventilatepro.com/exam/cli/install/#installation)
- [Token presets and project access](https://ventilatepro.com/exam/cli/install/#token-presets)
- [Command reference](https://ventilatepro.com/exam/cli/commands/)
- [Structured JSON output and scripting](https://ventilatepro.com/exam/cli/commands/)
- [Authentication and guarded writes](https://ventilatepro.com/exam/cli/auth/)
- [AI integrations and engineering workflows](https://ventilatepro.com/exam/cli/mcp/)
- [Markdown documentation for AI agents](https://ventilatepro.com/exam/cli/agents/)