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See Heat Pump and Defrost Cycle. A winter phenomenon produced by a heat pump, for which conditions have to be just right. If you actually catch a heat pump giving a steam show and have a video camera handy, it makes for one hell of a YouTube video.

Many heat pumps have interval defrost and will have a defrost cycle every 30, 60, or 90 minutes whether they need to or not, even if they are NOT frozen or iced over. The [ones] with more modern demand defrost will oly defrost on an as-needed basis, basically when there is ice/frost buildup on the coils. The best conditions for a steam show are when it is below 40 degrees, and a heat pump will freeze up much faster when it is wet, rainy, or snowy. However, a heat pump is capable of producing a good steam show on a nice, sunny day with no [precipitation]. The best steam shows typically occur below 37 degrees regardless of weather conditions.

How much steam a heat pump produces depends [on the outside] temperature, how much ice/frost/snow has built up on the outdoor coils, and the heat pump itself. To someone not familiar with a heat pump, a steam show can be misleading, and calls to the fire department in the winter by people claiming their heat pump is on fire are not [out of the ordinary]. Some stubborn customers also wind up spending hundreds of dollars on [unnecessary] service calls only to find out their heat pump is doing exactly what it is supposed to do.

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