Hi Marjan,
as long as your garage is in the temperature range of 8C – 25C you should be able to grow your mushrooms there fine as long as you maintain good levels of humidity and fresh oxygen.
Regarding the spores:
– it would be best to grow the fruiting mushrooms in a contained space (like the mini-greenhouse exmaple in the course) within the garage to reduce spore drop everywhere
– harvest the mushrooms before they drop too many spores
– the spores shouldn’t cause any problems to your house unless it is very humid in the house (RH 60%+), in which case they could germinate on wood/organic materilas, but it would be pretty unusual
– in large numbers the spores can present respiratory problems in some people, so it’d be best to avoid having lots of spores in rooms you spend alot of time in
hope this helps.
best wishes, Adam
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