The indoor %RH is determined by the outdoor dew point, amount of fresh air, and the amount of moisture added by the occupants. During typical fall weather, 45%RH is ideal. As long as the none of the indoor surfaces are dripping moisture, relax. 200 cfm of fresh air is much more than you need to purge indoor pollutants. 100 cfm when occupied is plenty plus the natural infiltration get upto 150 cfm. Overventilating with the HRV and the furnace fan operating is cost you much more than you will save. Most homes get more than enough fresh during cold windy weather. This is sad. Get a CO2 meter is you nervous about the amount of ventilation you really need. Cut back until you see some moisture on the coldest windows. Regards TB
Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"