Ventilation/air circulation is key in mold control, humidity is only part of the problem. Any area of your home that does receive adequate air circulation is vulnerable to mold growth. If you have forced air heating you should examine your air flow and circulation throughout the home, more often than not homes lack air returns in all rooms or don't have proper gaps under doors. Ducting from the furnace is also often done poorly resulting in uneven air flow distribution. Furnaces and fans can be undersized and filters can be clogged all causing circulation issues. Furnace fans can also be programmed to run more often for better circulation and don't forget to check humidifiers you may have installed, many humidifiers are out dated and use float valves that constantly fail and require attention to prevent them from constantly adding water to the air.
HRVs can be added to exchange stale air from inside with fresh air from outside while recovering the majority of the heat. A good addition to any home and these days it's often a standard in new homes. However typical installs usually result in the HRV piggy backing on the existing ventilation system. Running extra ducting may be required to solve air circulation issues in addition to humidity.
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