Here's a question to take your minds off the hot weather .
I understand that in a cold climate, the humidity levels in a house need to be lowered as the outside temperature goes down, to prevent condensation inside the walls or in the attic insulation. I have seen generic guidelines based solely on the outside temperature but I think these are oversimplifications because the real situation would have to depend on how tight the home is, the number of floors it has to create a stack effect, the inside temperature, winds, etc... Also, the maximum humidity should probably be based on the condition of the insulation of the top floor, where the pressure should be higher than in the basement, therefore causing more humid air leakage and a greater risk of condensation. Is there a measurement that can be done so that I can have as much humidity inside as is safe and have some peace of mind and proof that there really is no in-wall condensation happening? Has anyone experience in safely maximizing humidity levels during winter (up to a maximum of 40% or so)? How is that done with appropriate measurements (not just an outside thermometer) and hopefully no guesswork?