Why do long haul truckers warm up their engine for 30 minutes before leaving?

Question

Why do long haul truckers warm up their engine for 30 minutes before leaving?

In: 1252

Answer 1

All these answers so complicated. They’re just getting the climate set (AC/heat) and making sure it runs, air pressurizes, etc. Shouldn’t be idling for 30 minutes.

Edit: Oh yeah! The 30 minute part is a log book requirement if I remember right. 30 minute pre-trip inspection. I thought it was 15, but maybe it’s 30. Still shouldn’t idle for 30 minutes.

Can’t respond, but this link explains it. Truckers shouldn’t idle because fuel is expensive.
https://dragonflyenergy.com/what-is-the-best-apu-for-your-long-haul-truck-sleeper-cabin/