On Thu, 18 Mar 2010 03:19:15 -0700 (PDT), NogbadtheCool
wrote:

And should the thermostat be in the
sand or near the seedbed?

Depends on the type, some have probes that are inserted into the sand,
others are next to the seedbed. And there is the other type that don't
use a seperate thermostat

on the top to hold the pots etc and assumed the thermostat would go in
one of them.

Don't forget the more you use the seedbed, ie: fill it with pots, that
keeps the heat in and so, the running costs are kept down.