There are many popular furnace brands available on the market, and some of the most well-known ones include:

1. Carrier
2. Lennox
3. Bryant
4. Trane
5. Rheem
6. Goodman
7. York
8. American Standard
9. Amana
10. Armstrong Air
11. Heil
12. Coleman
13. Tempstar
14. Ducane
15. Payne

It’s important to note that the quality and features of each brand’s furnaces may vary, and you should always research and consult a professional before making a purchase.