I am building a house and am looking at installing a Harman pf100 pellet furnace instead of an oil furnace. The house is approximately 3,000sqft. Is this feasible? I have been quoted $3500 for the unit including the upgraded 1500cfm blower. Is the standard 3-speed 1000cfm blower sufficient? I also plan on having a pellet stove in the main living area as a back-up. Any advice is welcome...