I camp in the winter when it's very cold and although I now have a woodburner in my tent, for many years I went with no heating at all. Here are my tips:
It might sound stupid but there are two main things to insulate yourself from:
1 - the air around you
2 - the ground.
Campbeds are not good for this as they allow cold air to circulate underneath your body.
A good sleeping bag is important. If money's tight, army surplus British Army Arctic Down and Feather Bags will keep you warm down to minus 30 ish and you can pick them up for 20 - 30 quid!
For little ones, use an adult bag and tie a belt around the bottom to make it smaller - saves you having to buy new bags as they grow.
No matter how good your sleeping bag, you will never be warm if you're not insulated from the ground. Thermarest are very good. They really do make a big difference. Failing that use wool. Woollen blankets on the ground beneath airbed/thermarest will see you right. Cardboard is also very good (not very luxurious tho!). I often take a futon matress - very bulky, but if you have space, you get a great nights sleep.
A woolley hat is essential - most heat loss is through your head. Thermal underwear (longjohns etc) instead of pyjamas.
Hot water bottles are easy to take with you and get the sleeping bag nice and toasty.
Another trick is to eat fat before going to bed (not lard! something nice like butter on crumpets etc) Eating fat before you sleep makes your body produce more internal warmth - this is used in survival in Arctic etc.
Failing all of that, buy yourself a Black Cat or get ehu and some sort of electric heater. (Not the way I like to camp tho)
Hope this helps.
Maceman
------------- Gurt Lush
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