Jim wrote:
Hello,

I have a 2600 sq ft 4 level split home in Canada. It was built in
1985. This past spring we replaced our very non-effecient furnace with a
Tempstar 95% effecient gas furnace. It really is wonderful as the old
furnace would cause the house to feel sort of drafty and basement was always
cold etc... Now I have this furnace that I love to bits BUT now since it has
gotten colder outside these past two weeks, we have kept the doors and
windows closed and now have a high humidity problem inside the home IE:
fogged up windows (triple pane)...air basically feels clammy...bought a
humidistat and the house is sitting at around 50% humidity.... we use
bathroom fans in the shower, and have a fan over the stove when cooking that
we use all the time...we keep lids on pots on the stove etc...We have no
children and only the two of us in this home so no long lingering showers by
kids or anyone else....
I don't want to have to buy a dehumidifier over this new furnace..
sort of defeats the idea of trying to be energy effecient... Thinking of
trying to duct in an outside air source to feed the furnace?
Thoughts? Thanks... Jim

In addition to all the other good advice and questions, do you have a
gas oven/range? Been cooking/baking a lot? Normally no one pays
attention to the warning that the exhaust fan should be on when cooking.
Besides using up oxygen, it puts LOTS of moisture in the air.