The video offers a question and comment option,ask him?

Yes - I asked already - no response.

Doesn't surprise me,all those guys worry about is how many views they get. I'm not sure this will help you but most low volt circuit controls only control one side of transformer power,other side of transformer is hardwired in without means of interrupting it. I'm not sure why the second furnace needs that relay and can't just be wired parallel.

Thats because they dont want to overload and fry the transformer...

DIY assumes you know how to do it. It doesn't mean run to youtube / houzz or tiktok.

People providing how to info get paid by clicks, and the *appearance* of helping.

The method of twinning can and does vary depending on a host of various factors. I'm not in the business of guessing, but occasionally I decide to drop a few truth bombs here and there.

I don't care if you don't like it, I'm not paid by clicks. I'm paid by you to do it for you.

I service the Katy, Texas area.

Did he do it correctly or not?

I'm more of a comedian than I am a psychic.

Not going to comment on things *I don't know for sure* things are faked on the internet all the time for the sake of getting a "click". They call it click bait... it's designed to get you to click it. It's not truly designed to *help*.

If it was there to actually help you? --- you wouldn't be here wasting your time either. Would you?

If you want to learn: go to a trade school. (those cost money because they actually teach you how to do it.)