Let me know when I can buy one to install under my house in the crawl space. My house was built in the 30s before forced air was available and the ductwork is a

Let me know when I can buy one to install under my house in the crawl space. My house was built in the 30s before forced air was available and the ductwork is a retrofit because the crawl is almost big enough that I can stand up in it. We currently have a giant Rheem gas furnace and I'd love to replace it with an electric since they're no longer up to code as of this year.