The only trouble with the heaters ( all you sooks !!
) is that when you use them once, you are forever "soft".....
you'll never go back to being normal
I found after even using a small heater that attaches to a gas bottle, the whole tent becomes VERY warm....even stifling !! ( and no, I didn't run it while we slept, just for 15mins for the "soft" missus to get out of bed )
And yes, she does nag me sometimes if its cold, but I tend to ignore her most of the time !! ( its almost automatic after 30yrs of marriage
)