Quick Answer
Look, if your house feels like a barn—freezing in winter, roasting in summer—it's almost always your insulation. I've been crawling in attics for over 20 years, and it's the number one energy waster. The fix is usually a combination of sealing air leaks and adding more insulation (often blown-in). A handy DIYer can do a basic attic top-up for $500-$1500 in materials. A professional job for the same attic will run you $1,700-$3,000, but it's done fast and right. Either way, you'll feel the difference on your bill immediately, trust me.
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