Heat Recovery Ventilators are a popular unit. These units are used for a few purposes. The #1 reason we install HRV systems is high humidity where the windows are soaking wet. This is usually found on new or upgraded homes. As you upgrade your windows and doors, insulation levels will make a home more air tight. It holds in the moisture from showers, washers etc. It’s very important to have good bath fans and kitchen hoods but sometimes that’s not enough. An HRV will bring in cold fresh air from outside cross a core of room temperature air and be put back into your home controlled by a humidistat and will help keep your humidity where desired.