Over the course of the day today, Ryan and I have noticed the BNS inspiral range dropping starting around noon PST. Since it's mostly come back at this point almost 12 hours later, it seems to be correlated to a drop in LVEA temperature which in turn has raised the large corner station optics (BS and ITMs) according to their vertical top-mass OSEMs (see one- and six- day trends attached). Perhaps the HVAC system lowered the heat into the LVEA in response to the outside temperature rising? Since H1 has remained locked and observing over this time, I imagine the angular control loops have been keeping up with alignment changes, but possibly altering noise in DARM which has been affecting range. I don't believe any action is needed here, but I think it's still worth noting here how corner station temperature changes can affect our observation performance.