A covering over a compost bin will retain heat, which increases the rate of decomposition. Airing can still be done via vents etc, as you’re right that allowing free air movement is important.
It also prevents other elements from entering your pile, such as too much water, from a rain storm etc. Weed seeds could also blow in, and potentially not be killed by the intense heat that builds up in rapidly decomposing compost, which would then be moved to your garden, causing weed invasions.
I’d still cover my pile, in Sacramento, or San Diego.
Hope this helps. Good luck! Rob
An open airy compost bin will, in general, decompose faster than a covered pile, however in cool weather it may be hard for your compost pile to get warm enough.
Certain microbes only work at high temperatures, so having a cover will help regulate the temperature. It also will help retain moisture, in drier climates. As long as you don’t have a problem with woodland creatures, or the neighborhood pets, getting into your compost pile, you can feel free to just rake it into a pile, water it, and walk away. It will break down on its own without any help from you. All the things people recommend are just to make the things decompose faster.
To keep the heat in and the rodents out! It also helps to regulate the amount of moisture. If it rained a lot for a few days and you had no lid the contents would become sodden and this would stop the decomposition.
EDIT…My climate is similar to yours and I cover. The hotter the compost the better.
A covering over a compost bin will retain heat, which increases the rate of decomposition. Airing can still be done via vents etc, as you’re right that allowing free air movement is important.
It also prevents other elements from entering your pile, such as too much water, from a rain storm etc. Weed seeds could also blow in, and potentially not be killed by the intense heat that builds up in rapidly decomposing compost, which would then be moved to your garden, causing weed invasions.
I’d still cover my pile, in Sacramento, or San Diego.
Hope this helps. Good luck! Rob
An open airy compost bin will, in general, decompose faster than a covered pile, however in cool weather it may be hard for your compost pile to get warm enough.
Certain microbes only work at high temperatures, so having a cover will help regulate the temperature. It also will help retain moisture, in drier climates. As long as you don’t have a problem with woodland creatures, or the neighborhood pets, getting into your compost pile, you can feel free to just rake it into a pile, water it, and walk away. It will break down on its own without any help from you. All the things people recommend are just to make the things decompose faster.
To keep the heat in and the rodents out! It also helps to regulate the amount of moisture. If it rained a lot for a few days and you had no lid the contents would become sodden and this would stop the decomposition.
EDIT…My climate is similar to yours and I cover. The hotter the compost the better.
i don’t cover mine ,i use a pile. turn it to air it out ,you might cover it to keep out the rain or the pests ,or to keep the heat in.
the main thing is it keeps it from getting too wet when it rains
Well it stops the little ***** cats using it for u know whats so that has to be good!!!