Quote:
Originally Posted by t walgamuth
When you compare the cost saving in utility bills between unrepaired wood windows with no storms and new vinyl windows that is not the same as comparing it to refurbished wood windows with properly installed storm windows.
That would be the fair comparison but there is no practical way to do it.
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Infiltration is the primary energy loss with double hung windows, it is the nature of the beast. I have seen blower door tests performed on housing units with both new insert vinyl windows, and rehabilitated weather-stripped 100 year old double hung windows, with equal results. Add a decent quality storm and the old window becomes more energy efficient.
When performing energy audits we find the ROI (return on investment) in energy savings when replacing even poor wood double hung windows with vinyl replacements stretches out to years, very often beyond the design life of the replacement units.
Jim