Direct answer
Yes. Bonus rooms (over garages) typically have multiple heat-loss surfaces (knee walls, sloped ceilings, garage ceiling below). Foaming all of them as a continuous envelope often delivers 50%+ comfort improvement. Common Cincinnati pain point.
Authoritative sources
DOE Energy Saver guide to insulation types, R-values, and recommended applications.
Energy Efficient Home Improvement Credit, up to $1,200/yr for qualifying insulation work.
Energy Star recommendations for attic and wall insulation R-values by climate zone.
Related questions
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