We are looking at putting an insert into our fireplace to increase efficiency/heat output. It would be located in the living room with a chimney on the outer wall. Winters are fairly mild here. We would be mostly using it for supplemental heat. Our house is 2400 sq ft. Do any of you have any recommendations that would be a good fit for us? For supplemental heat, do you recommend catalytic or non catalytic? Sounds like better heat efficiency with catalytic, but trickier to get started and more maintenance than non catalytic.