
We bought it in 2016, so it's already our fourth winter. We take care of several feral and stray cats. It was originally in a plastic box with reflective thin insulation, the first 3 winters for 2 cats and it was fine. We recently built a 'tiny house' out of an open plan trailer and were concerned it wouldn't heat well enough. OMG this is amazing! Insulate and control drafts for your pets and this thing rocks! The tiny house inside is 3 1/2 feet wide, 7 feet long and 33 inches high. Lined with 2 in foam insulation. We just experienced -8 degree weather with a medium/high reading. Inside the temperature kept 80-90 degrees. 4 cats living in it were enthusiastic. Now we've set it to the lowest level and it stays between 60-70 degrees with an outside temperature of around 30 degrees. It works depending on the device you put it in. Use a box or kennel with the door open and let it get cold. Use double wing doors and keep them properly insulated for your weather and you'll be fine.

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