Bringing in outdoor air is a good thing but only if it can be controlled. Broan’s Fresh In supply fan ventilation system brings fresh air in from the outside—but only when it makes sense to do so. The fan monitors outdoor temperature and humidity levels and estimates the best time of day to run the fan. An ultra-efficient, variable-speed motor allows for constant airflow. The unit can easily be installed between ceiling joists with its flush-to-ceiling mount design using Broan’s decorative finish ring, and filters can be replaced in less than 30 seconds, the company says. The basic model costs $290 and the premium model costs $380. broan.com

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