In the next few years I want to build a cheese cave/root cellar (or one of each) out of stone,
cob, or strawbales, or a mix of the 3, I'd build it into the side of a steep hill, out of the sun, and probably have a sod roof, hopefully this
should be enough. There's an organic
dairy farm near me that have a stone cheese cave set into the hill, and all they've needed is to have a small window up the top, and maybe a small vent low in the door to allow airflow, if this works for them commercially then hopefully it will work for me on a small scale. They tell me that they don't really start hard cheeses in the hottest part of summer either though, so that might just be the best time for feta and halloumi.
In the short term, I have an unheated laundry with a tiled floor, this absorbs cold overnight, and doesn't get heated by sunlight or
wood heat during the day, except in summer when sun gets in for a short time in the late afternoon. Last summer some cheese I made was really too hot for good aging, and the fat began to separate and move to the outside of the cheese, but it ended up tasting OK in the end, just harder and drier, and not quite as awesome as cheeses that had aged well, but still tasty.
In this laundry I have an old meat safe, which is made of metal with lots of holes in it, and I've put my cheeses in there to keep insects away from them. I make cheeses with a natural rind, with salt rubbed on them every so often. I might try moving the meat safe to under the house where it doesn't get any sun at all once I'm making hard cheeses again.
I've made waxed cheeses in the past, some of them have turned out really well, but I think they're probably more sensitive to heat than natural rind cheeses, and not as flexible about when you can eat them - dry natural rinds will just keep aging if you need to leave them for another month or two, where as there seemed to be a point with the waxed ones where they got over-aged and had nasty flavours.
Other places I've successfully aged cheeses have been under a house on the cold side (it needed protecting from rodents and bugs to do this though), and also in a switched off fridge on a porch that didn't get any direct sun. Both of these were good, but I think it's best to have some airflow, so the old meat safe works well as a small-scale solution. Anyone good at building things could probably make one out of flywire and
wood, or they can often be found second hand.