> It's just that an HPS can make it much more expensive, and constrain you not to do things you want. This is so true in Boston. A lot of HPSs specify that you

> It's just that an HPS can make it much more expensive, and constrain you not to do things you want. This is so true in Boston. A lot of HPSs specify that you can't change the exterior facing portion of a building, even if you make every effort to keep the appearance while, e.g. adding 4 inches of styrofoam for insulation behind the siding, or if the changes you make are historically correct, e.g. 4 inches of styrofoam + stucco on top of brick walls. They don't particularly care about the interior, so often your only choice if you want to insulate is to insulate on the interior, which, ironically, reduces the building's durability.