My electricity is 0.0575eur/kWh and I live in a apartment building which can get pretty cold specially at winters -- would it be a bad idea to invest in a mining rig these days? It could warm up this flat im living in at the same time
Yes, it's bad idea. I wouldnt advise anyone to start mining, especially if you have no experience.
Another thing, if you get for free or very cheap the equipment or its part . Otherwise, it will end up selling your farm
Is it worth buying a mining rig now? I'm still building more of them, so for me the answer is yes. Your answer may be different.
What are you mining now if you're still building more? and is electricity power free for you?
AMD rigs mostly divided up between Ethereum and Monero, occasionally I'll drop a few of them on a new coin. NVidia rigs I pretty much just leave autoswitching on YIMP pools for BTC payouts. I'm building a new rig about every 2 months using some of the BTC to buy parts...basically I just troll ebay for cheap cards & various parts daily, and eventually a new rig appears.
Power isnt free, but I have 120 amps that's heavily subsidized. Have a friend with industrial power at his business...he eats the electical cost & cleared out space, and gets 25% of the coins mined. I have a few rigs and a couple Z9 minis at the house, and I just eat the power cost on those.
But for a small or even personal miner and to choose those coins which were having a lot of big miners is the worst story. We burned our GPU before we can touch 50% of our ROI. OP forget it and try another way.