This is a great product. Keeps the inside 10-11 degrees warmer than outside temps. Now, if the light would stay on until I turn it off that would be great. Not using it and switched to a paper thin LED that I can remote control.
The jacket arrived just in time for the -12 temperature we had during the big freeze. All four chickens stayed warm and cosy inside overnight and opted to sit inside during the day too! Front vent still allows for air circulation.