Is it worthwhile to use a gasifier to warm a greenhouse?

[pepe2000 (Richard "Pepe" Lemieux)]

Hi Garry,
I presume there’s a site we can search for the patents. Will you post it, if you have it? Thank you.
Pepe

[Chris (Chris Saenz)]

https://www.google.com/patents/US3090731

https://www.google.com/patents/US3140987

https://www.google.com/patents/US4476789