if you have a pc with a hd7850 a hd7950 a hd 7970 or a r9 280 a r9 290 or a
hd 6970 or a hd 5870 it is afree start up to mine LTC 1 ltc is about 30 usd.
what is your video card? I mention LTC because if you have a pc with a card named above built it will mine at a profit in most of the USA and Canada at the present time. shoot me a pm I would help you setup. BTC is more costly and harder to profit at the current time. Mostly because ASICs were invented to replace GPUS.
In general setting up a winning BTC mine in your home right now is not easy to do. Setting up a profitable LTC mine is easy if you already have the correct video cards.
I have 3 pc's mining at 1700Kh and pulling 600 watts an hour. It is cold in NJ so the heat of the 3 pc's is a bonus. here is a LTC calc
http://bitcoinwisdom.com/litecoin/difficulty
http://bitcoinwisdom.com/litecoin/calculator
1 hd7970 mining at 700kh right now will earn 7.4 coins in a month about 210 usd it will burn about 173 k watts of power and at my high NJ price of 17 cents a k watt that is 30 usd a month so since I have a pc with the hd7970 init I gain 180 a month.
plus free heat 173 kwatts a month is about 1200 BTU's an hour 24/7/31 IN DEC- MAR it pays me in free heat and cash. but I had the machine .