you know when its cold

Although not cold enough to now the weather has taken a chill with two hard frosts lately.These events are shown well  the compost bin,and with a family of 4 this can cause problems.On average we put at least half a carrier bag of compostables in the bin and the cold has slowed its workings down by quite a bit , even the worms have gone down into the warmer parts. We have a deliberation,get another composter on the go or cut down on our waste output, and as this stuff we compost is veg peelings etc. this is not what we want to do.If i turn the contents will the lower parts cool too much?  I will have to consult the oracle .