I currently heat with oil and am looking for a backup source. Wood and pellets are out due to health concerns. I've been reading about propane vented and vent free stoves. On top of this I have no fireplace and if I do a vented unit I want a metal chimney on the exterior of my house. Where do I begin? I'm getting overwhelmed by company info. Any suggestions would be greatly appreciate. Also, is installing a metal chimney on the exterior of the house that diifcult for me to do? I'm somewhat handy. Just found this site and can't wait to read /learn more. Thanks