How long ago did you turn it? Sometimes it takes my piles several days before they heat up after turning.

My bins are at least 36" on a side, usually bigger. I have been using cardboard to line my wooden pallet bins to help keep heat in.

BTW, I don't turn my piles until they cool off or if they get too hot. 148 is on the warm side.

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Ideally turning occurs just after the temperature starts dropping from the peak temperature. As the process progresses the peak temperatures decline.

I can't always follow the temperature trends and just turn once a week.

Other variables may also be a factor. The mix of the ingredients in terms of greens vs browns. Clumping. Too much water. Not enough water. Ambient temperature - don't turn overnight during the winter.

Turn and look and see what you're getting. If the dry woody stuff is sticking around and the wet green stuff seems to be gone then you have cause to add greens. Clumping just means you need to rough the stuff up as you turn. If it's dry add water. If it's too wet back off on the water.

Worst case scenario you will have a slow pile. Not a major disaster.

to sense

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Don't order 'another bin', especially if it is the same dimensions as the first.

A pile of 4' deep by 4' wide by 2.5-3.5' high is optimal in my opinion. A pile with these dimensions does not create heat, it merely saves what is created by your mix. And if you do not have a good mix, or C:N ratio to begin with, no pile or bin will provide high temp. numbers under any conditions.

SAMM
1) Size of bin (I use round mesh bin of hardware cloth 4' in diameter; and 2 to 3' high). Twenty bucks..
2) Air and Moisture as needed
3) good material Mix (called good C:N ratio, or mix of greens to browns.