Reflective insulation is most effective in warmer climates. True 100% Get Free Quotes Today! Question: Reflective insulation is most effective in warmer climates. Top Answer (100% of 5 votes): True. Answer: True Explanation: Reflective is more powerful where it usually just worm there no cold in the winters Saunders Insulation Answer: True Explanation: It reflects heat, therefore it is more effective in hotter temperatures. Smith Insulation Answer: True Explanation: Radiant barrier blocks radiant heat. TLS Energy Savers Get Free Quotes Today! Find Local Pros Free Reflective Insulation Installation Cost Estimates Related Questions How much does it cost to install insulation in Phoenix, AZ? Radiant barriers with high reflectivity and low emissivity are the most effective at preventing the transfer of heat into your home. Top answer: True Dust accumulation can disrupt the effectiveness of reflective insulation.Top answer: False Thermal insulation is more effective than reflective insulation in colder climates.Top answer: True How Much Does It Cost for Spray Foam Insulation?