there is a gas-fired wall heater that keeps the house warm enough. except for the room where we sleep, an addition down a long hall from the heater. we fixed that fairly well with a fan on the floor sucking low, cold air from our room, causing the higher warm air close to the furnace flow back into our room. so we went along for a month into colder, wetter weather keeping warm using the fan to evaporate any visible condensation, thinking we were keeping ahead of the damp.
well, there was the discovery that my only leather shoes, in a closet next to an exterior wall, had some green mold. hmmmmm. i moved them out of the closet and now we leave the door open.
but the damp is like rust: it never sleeps. it just creeps on in.
we keep a printer, a file cabinet, and a modem/router in a spare bedroom. we call it the office. there is a stapler, tape, printer paper, envelopes, and a stack of unfiled papers. robin went to get an envelope and found that all of them in the box were sealed shut. and the printer paper felt damp.
we wanted to know how humid is it in our house. we resorted to science. i recalled the drybulb/wetbulb method of determining relative humidity. we only have one thermometer so i recorded the dry temp (22 C) and then wrapped the thermometer in a wet sock and set it in front of a fan. after a decent interval i recorded the wet temp(18 C). a check with a handy weather calculator in the intertubes gave us a relative humidity of 68%. a bit of research indicated that a healthy level of humidity in a house would be below 50%, maybe best at 35%. we are all wet.
dry bulb wet bulb