The fuel powered heater is a Webasto unit installed under the front right footwell - drivers side for me, passenger side for you.
On mine, there is an option to turn it off in the heater controls and on my A8, I could set a two event timer over a daily cycle. It may well be possible to set it up the same way on the Q7 if it is turned on using VAG-COM.
On my wife's A4, there is an electric heater which is pretty good really, nearly as quick to heat up as the Webasto one, but it has no timed operation possible due to battery drain.
For the Webasto one it is possible to install a remote control via IOS or Android app and an SMS service to the car. I found one but I cannot really justify the cost - about £250 all-in.
Q7 4.2Tdi S-Line 2008 - another V8 diesel!
A8 4.2Tdi, 06, Grey/Grey - my new toy - how can a diesel be this fast? SOLD 21/06/2013
2010 A4 2.0tdi 6 spd SE Executive avant - dark blue & Vanilla - Wife's new one.
VW Touareg 06 30k 6spd 2.5Tdi - Wifey's new one, A4 was not big enough!
A6 2.7t 01my 6spd Avant 51k miles - Sold Dec 2011 - Gone to Banbury
A4 2.0FSi SE 03.8 22k miles - Wifey's new one - the golf was not luxurious enough. Sold 30/08/08 - gone to Heathrow.
Golf Tdi 03.08 130pd, 6spd, 19k miles - Sold 8th November 2006 - gone to Coventry!
A6 2.8q 98.11 115K miles - sold 20th Feb 2006 - gone to Kidderminster.
100 2.8q 92.1 147k miles - Sold 6th July 2004 - its new home is Edinburgh
A4 1.6 97.8 99k miles - Sold 12th Feb 03
VW Golf Gti 86 22k miles 2.0 Oettinger 190bhp, lowered, lightened and quick and sold 23/03/08. Gone to Coventry.