Universal Under Dash Heaters?

[NeoJuice]

Looking to see what people are running out there for heaters. I want to hook up to the stock window vents and maybe a floor option.

There are plenty of different universal heaters on speedway, EBay, aliexpress etc etc and I was just wondering if people were using any of these universal units.

I would like heat but also don't want to break the bank. Or have you scavenged parts from the wreckers?

1952 Chevy pickup.

Thank you and I look forward to your responses.