Yes, thats why i look for other countries with lower electricity. But the main reason is... i cant really host it at home. It will reach limits of home electricity, it will maybe be strange too to have such high electricitiy bills (in usa you could get a raid because they think you raise hash), its unsecure at home (miners were stolen already) and the price for electricity is high too. So datacentres look like the only solution to me.

If its true that watercooling isnt allowed then watercooling isnt a solution for me. The only thing i would try then would be to form a real tight airtunnel for my miners. From fan through heatsinks. This way i hope to optimize the heat dissipation through air. But i still search an appropriate material for forming the tunnel and fasten it. It shouldnt cause shortcuts and should be flexible and static enough.