Should I get a flat extension cord for under carpets?

Yes — flat cords are the right choice, but only if they’re rated for it. Standard round cords under rugs trap heat and create a fire and tripping hazard. Look for flat cords with a “carpet runner” rating and “indoor use” on the packaging, and avoid covering them with heavy furniture or sealing them under tack strips. Choose the right gauge for your device — never use a thin flat cord for a space heater.