You know, I would do a search on a good search engine and find out.
But, you know, 70% of all leakage is doors and windows, so you know 70% now the recipical being 30%, is this big expense worth it?
How long would it take to off set this procedure in energy savings? A long time, I would think.
Tackle the windows and doors and use the candle flicker test inside each window and door and this will tell you the problem areas.
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