We have a house with the old cast iron radiators. I love the radiant heat, but the radiators take up a lot of space. I am not interested in converting to forced air heat. However, I am also not crazy about the newer hydronic panels. I am guessing we can not afford to install the hydronic floors or ceiling (our house in 100 yrs old and had hardwood floors.) We are also wanting to install air condition. We were thinking so sort of high velocity or duct-less A/C system might be our best option. My biggest question is if it is possible to just replace the old radiators with either panel or baseboard heating, in the areas where we need the extra space, and not change the rest of the radiators. Is this possible or advisable?