Some types of Roman shades have sealed edges and layers of fiber batting. These types provide the best insulation.
Roman shades run between $50 to $100 for a 27 inch window. In terms of shade type, they generally cost more than honeycomb shades, are roughly the same price as pleated shades, and typically cost less than woven wood shades.
Costs vary greatly by region (and even by zip code). To get free estimates from local contractors, please indicate yours.