Glow engines will run well at -5 degrees C. But getting them started can be difficult. Once running, they run OK. You should buy a 12V battery (like a motorcycle battery or a small 12V lead-acid gel cell battery from the hobby shop) and a starter. This will make your hobby more enjoyable. Glow engines will sometimes start by flipping, but on some days the 12 V starter is the way to go.