if you are paying 34 us cents for a kwatt don't mine for profit.
that said if you want to mine for heat find an older antminer s-3 as it is pretty quiet.
Set it at a low clock then
point that antminer s-3 at
http://solo.ckpool.org/you either get nothing (most likely) or you hit a block (very unlikely).
but you will burn around 300 watts and have a space heater that does 300 watts.
300 watts = 7.2 kwatts a day which is 216 kwatts a month. that is 73.44 usd per month lost other then you get some heat.
but you do have a shot at every block as long as you run it.
