|
I think blanket statements about 20-30% loss are misleading. No question that your system could be checked and insulated in unheated areas of the house. But if they start with exaggerated claims, I don't think that bodes well.
Note that it's a reasonable volume, but relatively low pressure system. A few small holes probably won't make a noticeable difference if the ducts are clean.
Me thinks the dangers exist more on paper or in extreme cases than in typical settings. That's similar to the blanket claims of getting 20-30hp from a cold air intake. (Taking a rare instance and claiming it to be the norm.)
That said, if you have an older home and they can demonstrate that you really do have an issue with leaks....then it might be worth considering (along with just replacing the ducts). Their sealer probably wouldn't hurt anything, but it's more like wearing a Bandaid in case you get cut someday.
__________________
James
|