AskMarcel HVAC Technical Knowledge for ChatGPT

io.github.askmarcel/mcphvac

15 HVAC MCP tools: lookups, SKU provenance, guided PAC, Beta Harness sessions. 126 brands.

client:ChatGPT transport:streamable-http

Install AskMarcel HVAC Technical Knowledge in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mcp.askmarcel.app

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs