I was thinking of getting some gas logs since my utility bills are so
high. I have some gas logs that look good but give out little to no
heat.

I was wondering if anyone used VENTLESS GAS LOGS to heat their entire
home and if so, did they go to sleep with it on? I guess I am a bit
paranoid, even though my grandparents use to use an open flamed heater
for their only heat source. I am sure it was not ventless, but they
never had a window open and it didn't kill them.

However, I have taken care of people that had CO2 poisoning or
respiratory distress from using Kerosene.

My plan was to use the Ventless logs to heat up the den which is the
main room in the house. It is at the base of the stairs so the heat
should flow to the upstairs. I don't know if it would work or not.
My current set of logs uses a lot of gas with little heat output.
I compared them to a set of Ventless logs (at a FOAFOAF house) and
their ventless logs heated a room the size of my den in under 3 mins.
My logs will not even heat the room ( but they do look nice.)

I also have an air intake in the side of my fireplace. Would it be a
good idea to keep it open with ventless logs or is it not needed.

Any advice, both practical and academic would be most appreciated.

SS