faniebraai
RIP
Why would you want it to? Most of the resources I've read recommend temperatures in the low 20s to start with then ramping it up to low 30s after a couple of days. Given that it's winter now the lightbulb in the box is going to be the ideal, or maybe only, viable way of achieving these temps as well as maintaining the right level of humidity.
Or I suppose you could buy a dehumidifier and crank up the central heating.
from what i remember reading, 28C seems to be ideal, but hey, I don't think it's an exact science, and if the conditions are 90% correct, you can still get flawless biltong.
and yes, the seasons do have a big influence, and where you are located. I'm on the highveld, so our winters are very very dry in any case, so no real need for a light bulb. Light bulb will more be a must in the summer more humid months.
I think guys that stay in Durban have it worst... very humid air and they need to be careful not to make the box too hot otherwise you basically cook the meat, and will also get the hard outside and too moist inside.