Before going through all that hassle why not just buy a HFGH? That is Harbor Freight Green House. They cost as little as $300 for the 6 x 8' one. The larger size kit is 10 x 12' for only $600. They're attractive and can be moved if necessary.

We ran into this issue when replacing the lower sash cords for our side by side windows. Both windows needed new lower sash cords. We opened one window, and in the center there were 2 weights for the bottom sash. We were confused until we realized they used the same pocket for both windows: the bottom sashes for both windows used the same center pocket. Sure enough, the right window, right side pocket had only one weight; the left window, left pocket had only one weight. I'm sure the top sashes are set up the same way.

There is also information available in the National Parks Service Preservation Briefs about windows and many other aspects of preservation. I never discouraged anyone from changing their windows if there are no guidelines in their district for doing that. Actually I think lots of good information has been provided here by homeowners who are not working in the preservation business and speak from personal experience in either keeping or replacing windows. My frustration comes from people who buy homes in our historic district because they love the charm the guidelines have maintained and then decide they need to change protected aspects. No one has forced them to choose to live here. Appropriate energy efficient windows are not inexpensive. Anyone living here may choose to have those windows. Most requests here are for inappropriate windows and cost is the argument given. Shortsightedness at the time of purchase is not a justification here. We all "LIVE" in our homes and I would like to belie the insinuation that those of us who choose to maintain the architecture, including windows, are living in a "museum". That may be your perspective, but it is not my experience. Oberon works in the window industry. He provides lots of useful information and his opinion is valued. Many of us who choose to practice preservation are responding from personal experience and the outcomes we have had. In my neighborhood, there are guidelines for preservation and it has been proven to increase property values in this historic district. There are larger studies with similar quantified results. Most homes are under contract in less than two weeks. Therefore, it seems Oberon and I each have positve financial reinforcment for our opinions. I will not deny that my decisions also have an aesthetic factor. For those of you expressing concern for the environment I need you to know that by living in town and being able to walk to most destinations means I use less than one tank of gas a month. I also do not have air conditioning. I open my energy inefficient windows when it is warm. Imagine how much energy that would conserve if everyone did that. My point is moot for many because it is not realistic that the majority of people can, or are willing, to do that. I have noticed that brownouts and blackouts occur more during hot summer months than at any other time of the year. Is air conditioning and that comfort level also a drain on power? I don't have figures for how many less power plants the elimination of air conditining would result in. But, brownouts would seem to suggest use during hot weather does strain those resources. If we are truly concerned about energy consumption we should all get new windows and eliminate, or restict, air conditioning. There will always be some compromise. Comfort level is very individual. Windows are only one source of lead paint in older homes. I'm sure I'll be corrected, but the greatest issue with lead and windows is in the areas where there is any rubbing that could produce dust from the paint. Flaking paint on any surface should be a concern and abated or encapsulated especially if you have, or plan to have, children. If lead paint is the only concern with windows, the rub areas can be stripped and therefore eliminate the dust caused by the friction of opening and closing windows. Or, new tracks can be installed and the weight pockets can be insulated at the same time. Booksat makes a good point in taking into consideration many energy consumption aspects of older homes. Energy audits have been suggested a number of times on this forum. Windows are one aspect of loss and there are many ways to increase R-values in homes and windows. Window Guy is also in the window industry. He is sensitive to the window needs of historic districts and energy efficiency. I hope he will join this discussion to explain that you can maintain both aspects. Solutions may require compromise, but they should not be viewed at an either/or decision based on emotion. Also, energy conservation is multifaceted in older homes and in general consumption practices. If you are truly concerned about energy please look at all aspects of personal consumption. I agree that this is a sometimes emotional discussion. People on this forum will tend to lean toward conservation. Many would not have purchased older homes or participate on this forum if they did not like the qualities those homes possess. You will find lots of information about replacement windows on the Window Forum. Oberon an others involved in the window industry also offer their advice about new windows on that forum. We all have our passions.

I would leave window as is. The color of the draperies? Paint the mantel that color and see how you like the contrast.