Thanks, that's what I'm looking for when using an A/C rated in BTUs.
I imagine in cold climates that the electric used for the system converted to heat would equate to home heat savings.
Umm yes and no. What you're doing is using electricity to heat your home instead of natural gas. In most places I know of electricity is cheaper than natural gas/heating oil so yeah I guess you would be saving $ on heating costs. The thing is that you'd have to figure out some way to push all that heat from the miners and circulate it around the house. I wonder if anyone has setup a ghetto rig to push the heat into a furnace's ducts.
Electricity isnt anywhere close to cheaper than natgas, or people would be running generators all the time to make electricity to save money. This would quickly make the prices equal (modulo some consideration for ease of use/transport, etc).
The other way around. nat gas is about 3.5c/kWh of heat here for us. Electricity is about 12c/kWh.
If you are going to run your rig on electricity, then your electricity for the rig in winter, assuming it heats the house in the right places nicely (perhaps not, fan noise keeps it away from humans and humans are the thing that need heating, most of the rest of the house would be happy at 35F/2C all winter), then that just makes your electricity cheaper - 12-3.5 = 7.5c/kWh of power.
In summer its the opposite, with nearly double the cost for power + cooling. Not to mention extra AC noise and capital cost for the AC.