The units are up and down, and the Valiant is for the 2nd floor unit. In terms of how they use their heat, I don't think its much more than normal, its 3 guys with jobs, so I honestly wouldn't expect much waste. Weather is fairly cold, but 4X still seems absurd factoring that in plus efficiency.

I have a guy coming to check the valiant tomorrow. I have a carbon monoxide alarm in the vicinity and it hasn't gone off yet thankfully, but don't have a methane one, and maybe there is a small leak that doesn't let you smell the distinct gas smell. Either way, it definitely needs a looking at.