My Air Source Heat Pump system cost $13k installed in 2008, got Central air and retrofit ductwork and a 200A panel in the deal. Central Air by itself was quoted at $9k, so I see the ASHP as a $4k upcharge.
ASHP died after 6.5 years due to bad ice storm and my own ill-fated experiments.
Replacement compressor (outdoor unit) was $5k installed (in February 2015). I'm leaving it alone and expecting 10 years of service life. Operating costs are equivalent to ~$2.25 per gallon oil at $0.15/kWh PA wind electricity.
Installed new 80 gallon AOSmith HPWH, $4k installed, less $300 utility rebate. Now 4 years old, cumulative savings about $3k in oil.
Removed oil boiler and HW system for $500.
2013 Leaf S+QC, 36 month lease, 5/2014-5/2017. Total cost of lease: $10k, plus increase of ~$3k on insurance relative to earlier beater and about $1000 worth of wind power at $0.15/kWh. $7500 fed rebate to dealer is reflected in my cost, but not my taxes. We will have driven about 23,000 miles (would've been more but we were away about 7 mos total out of the 36). Total cost per mile, including insurance up charge: $0.61/mile. Maybe $0.20/mile or $4k greater than the beater it replaced.
Carbon savings:
EV Offset about 10 tons of CO2 emission, so our cost is $400/ton. We got a nicer car for our $$
Boiler used 1,350 gallons of #2 oil for heat and HW in 2006, corresponding to 16 tons CO2 annual emission. If you say my amortized cost of the equipment is $2k/year, that is $125/ton saved. We got a more comfortable house for our $$.
I think firewood is green, when burned clean under proper weather conditions.