To get the most efficiency

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Moderator Post (s) for this thread: > I had my 95 year old double hung windows replaced this last summer. by Bruno1949 on 03/01/2011

And to stop the wind for coming in you will want to replace the whole thing. Buying a custom piece to fit your sash may actually be mor expensive than replacing as a whole.

The NFRC rates just about every model of window. A home from the 70s is most likely to have standard size window so your choices should be plentiful.

Here is a link to their site:
http://www.nfrc.org/

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