For generations, many northern beekeepers have been taught that winter colonies need upper ventilation to allow warm, moisture-laden air to escape. But what if that familiar advice is working against the bees? In this episode of Honey Bee Obscura, Dr. Jim Tew welcomes Anne Frey to explain the condensing hive concept and why it has caused Jim to reconsider some long-held wintering practices.
Anne explains that a condensing hive isn't a special piece of equipment. Instead, the concept relies on substantial insulation above the colony while allowing the hive walls to remain cooler. Moisture produced by the bees can then condense on those walls rather than on the ceiling, where water might drip back onto the cluster.
They also discuss eliminating—or greatly reducing—the traditional upper entrance, the role of elevated CO2 in lowering winter metabolism, and why moisture inside the hive isn't automatically harmful. In fact, bees may use condensed water to help consume stored honey.
Anne adds an important practical caution: without an upper exit, dead bees, snow, or ice can block the lower entrance. Her own approach leaves a very small upper opening as insurance.
Jim and Anne close by considering insulating quilts, warmer climates, and whether top insulation might even help colonies during summer heat.
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Thanks to Betterbee for sponsoring today's episode. Betterbee’s mission is to support every beekeeper with excellent customer service, continued education and quality equipment. From their colorful and informative catalog to their support of beekeeper educational activities, including this podcast series, Betterbee truly is Beekeepers Serving Beekeepers. See for yourself at www.betterbee.com
We’d like to thank Vita Bee Health for supporting the podcast. Vita provides proven tools for controlling Varroa—from Apistan and Apiguard to the new VarroxSan extended-release oxalic acid strips—helping beekeepers keep stronger, healthier colonies.
Thanks to Bee Culture, the Magazine of American Beekeeping, for their support of Honey Bee Obscura. Available in print and digital at www.beeculture.com
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Honey Bee Obscura is brought to you by Growing Planet Media, LLC, the home of Beekeeping Today Podcast.
Music: Heart & Soul by Gyom, All We Know by Midway Music; Christmas Avenue by Immersive Music; original guitar music by Jeffrey Ott
Episode artwork created by Jeff Ott with ChatGPT by OpenAI. (Jim's regular cartoonist, John Martin, is on vacation and will be back!)
Copyright © 2026 by Growing Planet Media, LLC
