The UniHeat 40 hour heat pack (shipping warmers) is the most popular heat source for those who are shipping reptiles, amphibians, insects, invertebrates, fish, plants and other perishable items.
The 40 hour heat pack will activate in approximately 30-45 minutes and reach its peak temperature of 115°F (46°C) in approximately 4 hours. The heat pack will then gradually drop to approximately 100°F (38°C) for remainder of its operational life. One 40 hour heat pack will increase the temperature of a 1cu. ft. insulated box by approximately 10°F to 12°F. For every additional heat pack that you use, the temperature will raise an additional 10°F. Ideally the 40 hour heat pack is used for priority 1 day shipping, as they are not recommended for 2 day shipping options. Please order our 72 hour or 96 hour heat packs for shipments that require 2 or 3 day transit times.
Heat packs are not guaranteed to keep animals alive in all temperatures, as there are many variable to consider. Please use good judgement when packing live animals for shipping, their wellbeing depend on it.