Posted for "Bryan J. Burr" <bjburr@mwheli.com>:

 Dear Ed,
 
 I have the Lancair ES with the TSIO550E engine.  The cabin heat is taken
 from the hot side of the turbos using the same outlets that the IVP uses
 for pressurization.  I can tell you that it is adequate for the pilot
 and front passenger but the rear passengers are uncomfortably cold.  To
 the point that I installed electric seat heaters in the rear.  I use the
 standard mixing components provided by Lancair and the heat is not
 enough to worry about.
 
 Bryan
 N132BB