Probably a good chunk of change...I’ve been running @Home since before I was a FReeper.
Then I congratulate you on having the guts to back up your convictions. A lot of people on these space threads don’t. (I still don’t agree with you though.)
my son kept his computer constantly on(that we bought him and powered)for years constantly checking for SETI.
when he burned it out, I let him buy his own (actually he makes his own computers now...or assembles them or whatever you call it) when his own finances were involved he stopped using them for SETI.