With our heat recovery ventilator ratings, you can cut through all the sales hype and find the best value. We have researched the manufacturers' data and combined it with our HVAC industry service experience to produce our unique system of ratings. These reviews are for systems that moderate the temperature of the fresh air that is brought into the home. For systems that moderate the humidity level as well as the temperature, you can check out our erv ratings. We have given you our top picks followed by a complete list of manufacturers and their ratings.