I'm looking to deep-six my oil heat in favor of natural gas. I've talked to a two places so far and for a 95% efficiency furnace, I'm looking at about $5000+. Tack on a water heater and it is up to $7000 after I factor in our wonderful 9.5% sales tax. Does this sound about right? This work doesn't include decommissioning the oil tank (another $600), but does include removal and recycling of the old furnace and water heater. Ugh. Money.