We'd like to put an insert stove into our old fireplace for supplemental heat in an emergency. It will not be our main heat source, just a backup. I live near Denver and it gets cold! Today the heat was off, and we nearly f-f-froze. The main issue is that my mom, who lives in the house with us, has lung disease and cannot tolerate a lot of smoke. Can anyone tell me how smokey modern pellet or wood stoves are in their practical use? Are they safe for people who are on oxygen to be around? She is not going to be opening or putting fuel in it. Any recommendations on whether to go with pellets or cord wood? We have property and tons of dead pinon and juniper wood available. But pellets sound pretty convenient as I'd likely be the one putting up the firewood. Your thoughts?