Two clicks. A free Claude account, or ChatGPT, is enough.
Once connected, your assistant calls on our HVAC calculation engines whenever your prompt needs them. Your LLM gives you a quantified, justified result without leaving the conversation.
Our tools compute on the data your models contain. The AI only steps in to make up for gaps in the model or approximations in the modelling. The calculations are reliable and can be checked: download the calculation files generated automatically.
We recommend Claude: it accepts a custom connector even on a free account.
https://thenewengineer.com/mcp
In Claude, click your name at the bottom left, then Settings. In the left column, under Customize, choose Connectors. Click “+ Add” at the top right, then Add custom connector.
Open Claude's connectors ↗
In the first field, type a name, for example The New Engineer. In the second, paste the address above: https://thenewengineer.com/mcp. Click Continue: the connector appears in your list with a check mark.

Click thenewengineer.com in the list. Under Tool permissions, set both groups – Interactive tools and Read-only tools – to Always allow. Otherwise Claude asks your permission at every question.

In a conversation, click “+” at the bottom left, then Connectors, and switch on The New Engineer. Then ask your question as you would a colleague.
Size the expansion vessel for a 1,500-litre heating system, 70/50 °C, 14 m static height, safety valve set at 3 bar.
Claude's free plan accepts one custom connector. Once added on the web, it is also available in the desktop and mobile apps. Using another assistant? Our connector is built on MCP, an open protocol: any MCP-compatible AI can use the same address.
Scope: building services — heating, air conditioning, building cooling, data centres and plant rooms. Cold rooms, food refrigeration and industrial process cooling are a different trade, and the tools say so rather than answer for them.
ChatGPT accepts a custom connector on paid plans only — Plus, Pro, Business, Enterprise and Edu — through its developer mode, in the web version.
https://thenewengineer.com/mcp
In ChatGPT, open Settings › Apps & Connectors › Advanced settings and switch on Developer mode. OpenAI moves this switch from time to time: if it is not there, look under Settings › Security.
Open ChatGPT's settings ↗Back in Apps & Connectors, click Create. Name it The New Engineer, paste the address above, leave authentication off, and save.
In a new conversation, click “+” in the message box, then More › Developer mode, and tick The New Engineer. Then ask your question as you would a colleague.
In a conversation, the AI answers when you ask. OpenClaw goes further: it is an open-source agent that runs on your own machine, keeps the context of your projects and chains tasks together without you guiding each step. Connected to our skills, it can for example run a series of sizings and hand you a summary note.
For example, in Telegram“Size the expansion vessel for 2,400 L of water, highest point 18 m above the vessel, and send me the calculation note.” The agent calls our calculation, then replies with the figures and their formulas.
Follow the official installation guide. If OpenClaw is already running, skip to step 2.
OpenClaw documentation ↗One command in a terminal:
openclaw mcp add thenewengineer \ --url https://thenewengineer.com/mcp \ --transport streamable-http
Or simply ask your agent to add the remote MCP server “thenewengineer” at that address.
openclaw mcp doctor thenewengineer --probe
The command lists the available calculations. From now on, your agent uses them whenever a task calls for them.
{
"mcp": {
"servers": {
"thenewengineer": {
"url": "https://thenewengineer.com/mcp",
"transport": "streamable-http"
}
}
}
}