The answer to 'which is better furnace or boiler' is that both furnaces and boilers have their own advantages, and the best option depends on your specific home and heating needs. Furnaces use forced air to distribute heat, while boilers use hot water or steam to heat your home. Furnaces are generally less expensive to install, but boilers can be more energy-efficient and provide more even heat distribution.
Furnaces are a good choice for homes that already have ductwork in place, as they can leverage the existing air circulation system. Boilers, on the other hand, are a good option for homes without ductwork or in need of a complete heating system overhaul. Boilers also tend to have a longer lifespan than furnaces, typically lasting 15-30 years compared to 10-15 years for furnaces.