Treatment
Freezing bed bugs: at what temperature, for how long
Cold kills bed bugs, but slowly. The Olson lab established the practical threshold: −18°C (0°F) for 80 hours in a sealed bag kills all life stages including eggs. Done right, freezing is excellent for items that can't take heat. Done wrong (or rushed), it does almost nothing.
The numbers
- Lethal core temperature
- −18°C (0°F)
- Hold time at −18°C
- 80 hours minimum
- For chilled (−10°C / 14°F) freezer
- Doesn't reliably kill
- Quick-freeze (industrial −30°C)
- ~24 hours
Source: Olson, J. F., Eaton, M., Kells, S. A., Morin, V., & Wang, C. (2013). Cold tolerance of bed bugs and practical recommendations for control. Journal of Economic Entomology, 106(6), 2433-2441.
How to actually do this with a household freezer
- Verify your freezer reaches −18°C. A $5 freezer thermometer at any hardware store. Many domestic freezers run at −16°C or warmer in practice, especially if frequently opened or full. If yours is warmer, turn the dial to coldest and verify again before treating anything.
- Seal the item in a plastic bag. Two reasons: prevents condensation damage when you take it out, and keeps freezer odors off.
- Squeeze the air out. Less air = faster core cool-down.
- Place it where it won't get disturbed. Back of the freezer, not the door rack. Every time the freezer is opened, internal temperature climbs briefly. Items in the door rack and front warm fastest.
- Leave for 80 full hours. Not three days of opening-and-closing, three full days during which the core stays below −18°C.
- Take it out, let it warm up sealed. Don't open the bag immediately when frosty. Let it reach room temperature inside the bag to avoid condensation wetting the item.
When to freeze instead of heat
- Electronics without batteries. Heat chambers risk damage. Cold doesn't. Make sure to remove batteries first and let warm-up happen sealed.
- Old books with delicate glue. Modern glue is fine in heat, but old book bindings can release. Freeze is safer for valuable old books.
- Vinyl records and tapes. Heat warps vinyl badly. Cold is safe for both.
- Wax-based items. Candles, crayons, lipstick.
- Photos, papers, certain art. Less heat stress, less paper-curling.
What freezing won't do
- Kill bugs in a mattress. Core won't reach −18°C in any standard freezer, and a mattress doesn't fit anyway.
- Work at "freezer pack" or "ice in a bag" temperatures. Those are −5 to −10°C at best, not cold enough.
- Work in an outdoor winter day. Even at outdoor −10°C, the lethal threshold isn't reached and warming cycles disrupt it. Bed bugs are surprisingly cold-tolerant in shorter exposures.
- Be a substitute for room treatment. Freezing handles items you can put in a bag; the rest of the room still needs heat, DE, or professional treatment.
Heat or cold?
For most items: heat is faster and easier to verify. For things that can't take heat, freezing is the backup that covers the rest.
- Clothes, textiles, soft toys: 60°C wash + 45 min dryer, or heat chamber.
- Suitcase, leather, books, shoes: heat chamber.
- Electronics, vinyl, old books, wax items: freezer at −18°C for 80h.
- Stuff you don't need to use for a year: sealed plastic bag in a closet (bugs starve out at room temperature in ~5 months, longer in cold; 12 months to be safe).
Sources
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