Thanks for this suggestion. I need to be as snug as possible in the cold winter months here in Beechworth, ( the rest of the year is glorious), and I'm looking for the most effective insulation for the windows. I believed cellular blockouts would achieve this, but then thought Double glazing + blockout might be "over the top". I can't see draped curtains being so effective; perhaps I might settle for the blinds, and add some curtains for decorative effect. I can pay $3000.00 if they will achieve the insulation I need.

Hello, this is exactly why window treatment specialists such as ourselves exist! There are a lot of options depending on your preference for internal look. Some simple ideas such a dual roller blinds have already been referenced. You’ll have to meet with a consultant to see how two fabrics pair, especially if you’re considering one being light filtering. You can also mix treatments such as a dark roller blind recess fit to the window, and a light roman blind fit over the architrave which will give you a soft fabric finish. Alternatively white plantation shutters contrasting an exterior black window frame can actually look really stunning. It does depend on the style of the black framing you use. Feel free to post a picture of your style of window frame used and I can try to help you online Shannon -RPShutters www.riverinaplantationshutters.com.au

Double Hung Windows (aka sash windows) allow you to enjoy the benefits of natural light and air in any context in your home, including areas with limited opening spaces By opening both sashes halfway, of a double-hung window, you allow for more air flow than a single-sliding window. The top sash opening helps hot air to escape. While the lower sash opening draws in cooler, fresh air. Would you install a Double Hung Window over a normal sliding window?

yes...but windows need to suit the room inside, orientation and outlook and looking at your photo you may find that it's more cost effective to remove three small windows and replace with one big window that may be all sliding or have sections of fixed glass and sections of awnings or double hung windows either horizontally or vertically...but do you need every window in the original size and location? ..take photos from every side of your house and make a numbered list of the sizes of all the existing windows and you can discuss with a window supplier to get an idea of costs BUT windows are such a vital feature of passive solar design that you should take this opportunity to rethink every window....does every window suit the purpose, are some windows too big, too hot inside, in the wrong location, not private, missing a good view or cooling breeze...check yourhome.gov.au for advice to get the best results for such a major investment and you will need skilled help to remove and install so also time to consult a builder