Conservatory insulation

[brass monkey]

We keep the pooches in there at night. The stat is set at 15 and the heating still fires-up some nights, even now. It's a straight conservatory (verandah) 19' x 9' and pooches are allocated half of it (together with the stat). I was thinking of using polystyrene sheets under the polycarbonate ceiling with a decent curtain to the floor, half way along.

1. Are polystyrene sheets a good idea?
2. How do I suspend them? TIA

Incidentally, if you keep all of your CH radiators turned on, they pay you too much ;) I've reverted to a gas fire in the lounge, wall mounted fan heaters in loos and 1 CH radiator for the !"£$%$£"! pooches.

[Harry Bloomfield]

brass monkey formulated the question :

I would not have thought so, they are quite inflammable.

[The Natural Philosopher]

And you cant draw them up over your head when the party political broadcasts come on.

Stick to cotton.