Regardless of it using close to the same amount of power as an electric furnace for a house...  How do you expect to move air around the entire house?  That is literally what a furnace does in a house, it is moving the air to the vents in your home, apartment, trailer, etc.  And before you try to say "But it could be done" like your watercooling theory you can't just throw the unit in and hope it moves enough air unless your house is 8x8 lol.  I'm sure you've watched a few YouTube videos where people try and do it...  Go look back it doesn't work to warm up a house you still need your heater.  BitcoinSoloMiner do you actually own any ASIC miners or familiar with them at all as in hands on experience?  Have you ever heard how loud an S19 is even in "LOW POWER MODE"?  Even back in the S1 days when they could easily run on 110V power they weren't quiet. 

And Stompix is right when summer comes around you have to battle the same heat that the S19 is putting out in the winter, it doesn't magically become an AC for your house.  So now it's summer and in order to counteract the heat you have to run the AC even more because Power = Heat regardless of how you put it.  So now you have to dissipate your 2400W of power being used by cranking the AC even more, and your idea of letting it run in non lower power while your gone is going to cost you even more. 

Plus in 3 years reselling it down the line...  Again I get it you are new to bitcoin but 3 year old hardware doesn't bring anywhere near the money you think it does...  Plus this isn't something you can run on 110V power like the S9 so people buying them used to just play with or make a heater with aren't going to want to buy.  Any major mining companies deal directly with bitmain so why would they want 3 year old and horribly inefficient hardware (by then)?