Originally Posted by MikeJ
Thanks for that. Hope it not a silly question but about the mat..... when you say lower night temperatures do you mean to keep the temperature at a lower temperature through the night or to keep temp up when the nights are colder (ie winter).
a bit of both.. you need to turn all the heating off at night but also need to keep it at a reasonable temperature - ie don't let it get to -38c (for example).
95% of the time you won't need to raise the temperature at night, but if your house is very cold at night in winter then extra heat can come in useful..