Heat pump is not compatible with a water-bearing fireplace

Should I just let my groceries spoil? Sorry, but we don't have a basement. Feel free to tell me how I can do it better / correctly.

Which groceries require that a window is constantly open? There are countless people who built without a basement, and I'm sure none of them keep a window open all the time. That's not a good idea in winter, no matter what you heat with. We have a storage room where the heating is turned down, but since it is near the living area, it is practically as warm as everywhere else. We have no problems with spoiling food. Anything that needs to be refrigerated goes into the fridge.

Which foods require a window to be open all the time? There are countless people who have built without a cellar, I'm sure none of them have a window open permanently. That is not a good idea in winter, no matter what you heat with. We have a storage room where the heating is turned down, but since it is near the living area, it is almost as warm as everywhere else. We have no problems with food spoiling. What needs to be cooled goes into the fridge.

200 kilograms of potatoes, just as many apples, carrots, etc. at 20 degrees, which I easily have otherwise when the window is not open, you can throw all that into the trash after a short time.

2 hundredweight of potatoes, just as many apples, carrots etc. at 20 degrees, which I usually have easily when the window is not open, you can throw it all in the bin after a short time.

But that is poorly planned. In modern houses, even the cellars are no longer quite as cold, but they would still be more ideal for storage.

Well, you can cross off the potatoes.
You need a well-ventilated cellar for that.

Well, you can strike that about the potatoes.
You need a well-ventilated cellar for that.

That's why the window is constantly open, but it's still too warm…

Sure, that won't work, it should be <7°, better <5°