The Most Efficient Greenhouse on Earth | $100 a year to heat in -40C with Sand Battery Thermal Mass

The best thing about Dean is that he is just a real world guy with real world experience that built a greenhouse that works for four seasons. He's not a consultant trying to sell something and i proud to call him my friend. I couldnt have built the greenhouse without his ideas.

You two need to collaborate on a 'Greenhouse Build & Grow' manual/book.

55 years ago I sat many a cold snowy nights and drew plans for buildings that were self sufficient.....never got ..love to see someone who did...thanks

I’m an old mechanical engineer - I love thermodynamics and the science of heat transfer - you guys are brilliant- keep tweaking your designs!!

It's so inspiring to see real ordinary people do extraordinary things.

I was glued to the computer screen absorbing everything I could. Yup, Patrick needs a YT channel.

Now this dudes math is definitely mathin’. Bravo sir.

Wow. Another great setup in a cold Canadian climate. It is sooo well done especially with that sand battery. Growing your own food for food security. Awesome!!

Thank you so much, Dean and Patrick, for showing us how to heat a greenhouse in a cold climate. We live in Norway at 59 deg north, so our climate is pretty much like yours, but with a bit milder winters. We reached -28 deg C in January this year for the first time in decades, usually it goes down to -17 a few times each winter. We have slightly shorter days than you in the winter (but very long summer days!). We have started to build our greenhouse at the south wall of our barn, so it will look pretty much as your greenhouses, 20 m long and 5 m wide. And now I know how to make the thermal mass floor thanks to you guys! So as soon as the rain stops and the ground dries up (frost has gone now), we can start digging and insulating for the thermal mass floor. Looking forward to have a greenhouse this winter! Greetings from Norway

Well done!!! Food security is top priority and you’ve both proven that we can grow in Canada with the right know how and gear. I love all the heat syncs and use of passive solar heating.

That was an impressive greenhouse build with the thermal sand battery.

This is awesome I'm going to be moving to Saskatchewan to be closer to my son. Leaving my home and garden on Vancouver Island so I'm going to need something like this to keep me busy through those cold winters

Thanks for sharing this greenhouse, nice to see the sand battery in use XD

This system and all the concepts included prove that it is possible to overcome any issues with weather, and to build closed systems that are very productive... Nice pack of GSDs BTW...

Bees want to travel as far as it can and then working home. I worked on driving milking truck from farm to diary and we do the same as bees. All route is to drive to the farthest from diary and then work home. Then i only needed to drive from the closest farm full with 42metric ton milk, total 64 M.ton (Sweden). So is no wonder they flew to the window. The only bee who is "smart" enough to understand windows/greenhouse i have seen is leafcutter bee. I hade wild leafcutter last summer in the greenhouse, they maneuver opening like a smart animal. They never ever did "smash window" as other insects, with a big leaf cut under them (same size as the bee). I really love leafcutter bees. Hope her babies survived the winter in my greenhouse.

I've been planning a passive solar greenhouse with evacuated tubes, and this is a few steps ahead of anything I imagined. Fantastic accomplishment! Ideally, I'd have a wood / pellet boiler that can also heat water and have the greenhouse heat my home as well. Add a hot tub in the greenhouse and that's my dream!

Thank you for the excellent info

Patrick, this is a super build! Would you consider doing a series of videos on construction / systems details? It would be incredible! Just have tons of questions... pony wall windows, foundation insulation (below 2x6 walls), details on sand battery dimensions & construction, aquaponics system components, media, testing, feeding, etc. You've done soooo much it is monumental. Congratulations!! Hope there's more details in the future. Would you be into tours later in the year (for those nearby)?

Outstanding, gentlemen. Cheers from 🍁Ottawa🍁

"If you don't try anything, you don't learn." WOW! Convincing people they DON'T know everything while confidently staring down their weak poker faces, has been my largest obstacle to entry for 10 years. Once ya see it, ya can't un-see it huh. You two are amazing!