Never yet had a heater in a tent, not in 30+ years of camping. The secret is clothes, lots of layers of them. Good old fashioned woolen jumpers work better than most microfleece layers, unless you buy the hi-tec mountain stuff. Chain store thermals are okay though. Wool socks for wearing in bed are less sweaty than fleece ones.
A good sleeping bag is another essential, with some sort of insulation layer between you and the airbed if you're using one.
Hot water bottles and hot drinks before bedtime also help. If you change into your jammies over in the toilet block where it's warm then put your top clothes back on over them till bedtime, this will stop you...and especially kids...getting chilled.
Close the sleeping pods up before evening time. This helps conserve warm air inside. Keep them closed as much as possible at night...if you get up to go to the loo, for example, close the pod behind you. And keep your sleeping bag closed to save you having to warm it up again.
Keep the tent zipped down too if it's really cold outside.
Finally it's a fact that almost all camping newbies underestimate how cold it gets at night outside, even in high summer. Just because you can sit out in your garden in a t-shirt at 9pm doesn't mean you won't be freezing at 2am in your 2-season sleeping bag at the campsite down the road. Even in August, let alone the start of May!
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