Mostly older houses do (< 50s), and yes, wood is the most cost effective. This house is > 70s, doesn't have a chimney, but we're considering installing a cast-

Mostly older houses do (< 50s), and yes, wood is the most cost effective. This house is > 70s, doesn't have a chimney, but we're considering installing a cast-iron wood burner in the house center for this winter.