Re: Good to Change from Boiler to Forced Air?
Just to echo the consensus, hydronic heat is preferable. If natural gas is available, use it. That would be my idea of a perfect system, but, alas, I have to use $$$ Oil.
You can replace the bulky cast iron rads with the slimline European ones, or even baseboard convectors.
I have replaced one cast rad with a tin one (in a bathroom) and another with a fan-forced toe-kick heater (kitchen) and both function as well or better than the cast boat anchors.
Manufacturer of European Rads:
Remove not the ancient landmark, which your fathers have set.