free heat. build a heat box for $6 and heat 500+sq feet, for free. during sunlight hours, i suppose.

does anyone have any experience or expertise on this claim?

youtu.be/xixGrSHxNGU

@holon42 The design on this one isnt the most efficient. I have 4 3 that fit in reg windows and one that sits on the ground 3'x4' there are lots of different designs. They have 12v thermostats and small fans. Using them last 2 winters I reduced heating gas by 66% both years. They do work the larger one so well I have to replace solar fan it had with a 220cfm air mover (6watt) to keep its internal temp below 200 - they draw air from inside & warm it

youtube.com/watch?v=xixGrSHxNG

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@Lucky188

excellent ‼️ thanks for the info βœŒπŸΎπŸ™πŸ»

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