I was poking around in the crawl space in our "new to us" home and I found an outside air vent connected to some insulated flexible hose which was then connected to the cold air return duct for one of my furnaces about 8 feet away from the furnace. Is this a stupid setup? I though make up air went into the room or into a "special" bucket? Won't this pull in more cold outside air than it should?

Hello, I have a home that is about 2 years old. Around a number of our windws we have wood extensions. Some of them are showing signs of a raised bubble that is discoloring the stain on the wood. The main area of issue is with a couple of the windows on a north facing bathroom. We run the fan after showering for 30-40 minutes normally to try and remove the moist air. We also have a lot of moisture buildup around all windows within the house in the winter and we run a dehumidifier 5 out of 7 days a week all day/night which has seemed to help with the moisture around the windows part to some degree. Someone asked if i had an air exchanger and should really consider one where we live and with what I was telling them. It would do a few things for me including possibly remedying some of the issues i mention above but also reduce my heating and cooling costs. Some stats of where I live. I mentioned north facing bathroom. I live in ND and the north side of the house is always coldest as it gets pounded with a stiff north window for much of the winter. Any ideas on what is causing the issues I mention above and would an air exchanger remedy these things do you think? Also, how would you go about installing an air exchanger in an already fully finished home? Thanks for the help.