I'm seeking comment on what might be reasonable cost to install a new furnace. I'm in western Massachusetts. I've got three estimates. On low end, 10 hours labor at $100/hour. Additional cost of $1500 for materials plus the $2800-$3000 for furnace. On the high end I was quoted $7500 total for same or similar furnace. Wasn't given a breakdown for the additional $4500 beyond furnace. I'm aware that there's some addditional work needed to install venting of furnace exhust and condensate, so am expecting to pay more than $2000 for installation beyond cost of furnace. Just feel that the higher estimate is rather high.