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Replace oil steam system with...?
My 1600 ft2 Boston-area home has oil-fired steam heat and window A/C units. The boiler is also our tankless water heater. We dislike the radiators, definitely hate the oil tank, and are in the midst of adding a couple of rooms (one atop the other). Winters get cold and summers get hot. My options (and my perception of their respective pros and cons) include:
1) Converting boiler to gas and keeping the steam. Add minisplits for cooling. (Pro: maybe least expensive; Con: still have radiators; least energy efficient option)
2) Converting to gas, upgrading boiler and installing forced hot water system. (Pro: most efficient central heat option?, we ran some hot water lines years ago in anticipation of doing this and converting steam radiators to run on hot water; Con: $$$; converting steam radiators -> hot water might not work very well)
3) Replace the steam system with minisplits for heat and cooling. Maybe add a gas fireplace insert for coldest nights. (Pro: most energy efficient option, multi-zoned heating and cooling, good utility rebates for minisplits; Con: concerned about permanence of removing steam pipes and radiators; would need to buy a water heater)
4) Replace steam with furnace and run ducts all over the house (Pro: Would eliminate radiators, Con: Not necessarily a fan of forced hot air, new duct work would take up space in closets, etc.)
Any professionals out there have any opinions on the wisdom of any of the above options? Are there others I'm missing? Thanks in advance!