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The best methods for insulating floor joists in a crawl space to improve energy efficiency and temperature regulation in a home include using rigid foam insulation boards, spray foam insulation, or fiberglass batt insulation. It is important to seal any gaps or cracks to prevent air leakage and ensure proper ventilation to prevent moisture buildup.

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Q: What are the best methods for insulating floor joists in a crawl space to improve energy efficiency and temperature regulation in a home?
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