We replace our 20+ year old seal-blown windows with new ones. Cost an arm and a leg, and saves us 30% on our gas bill (quite shocking when we reviewed our annual numbers).
I'm not sure what your asking. I wouldn't consider putting new-fangled equipment in my house until I had done an energy/efficiency audit. Find out where the heat is leaking out, and fix the cause.
The KVAR appears to be some sort of electrical appliance. I don't see how your electricity bill could be higher from new windows -- unless you have electric heating?
If you're trying to find out why you have higher electric bills, a Kill-a-watt (meter) is your friend.
Hants (KD0CXL) 97 LX450 Slee Armor, 285 BFG/AT, OME 2.5", Altitude Compensator, Kimberley Kamper
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