Replacement sash kids tend to be cheaper then full windows and are much easier to install, take the window size you have to some home improvement stores and get a quote, we can speculate all you want on price but you need to get a price for what you need.
It sounds like for summer sun you need an over hang or awning and in the winter you need your house to be sealed better, get an energy audit done, $300 or so and you will find the areas to focus on, saving you well over $300 in renovations that did not need to happen.
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