TDS reading at room temperature?

[Jake]

When producing water, the temperature of the room won't make any difference. The difference is the temperature of the water coming out of the tap that is going into the membranes.
In winter the tap water is colder so the r/o will work slower as the water is more dense - ice is a solid. As the water warms it becomes less dense so its easier for it to pass through the membranes. The viscosity of most fluids change with temperature.

If you warm to incoming water into your r/o in winter, the r/o will produce water faster.

Yes it's faster warm, but results are worse,

The air conditioned rooms these guys use are huge spruce, the water is cooled in the room, and the ro membrane is very cool in temp which helps a lot