Originally Posted by
pitchattitude
While that may be what most do, that’s not what is supposed to be done. Supposed to single engine taxi with APU shut down until necessary. The 175 does just fine keeping the temp comfortable on one bleed source. The mantra on the 145 was don’t turn the APU on at all because they were leased and it needed all the help it could get with keeping things comfortable.
Pfftt the mantra on the 145 was run the APU and three engine taxi as much as possible because the packs sucked on the ground running on engines.