Gas and Oil Furnaces MODEL XR80 Responsive comfort XR Single Stage Furnaces Featuring self-diagnostic controls, the XR80 automatically orchestrates your heating system's operation for optimum performance. Less worry, more comfort - that's the adamson way. MODEL XR80 features: Efficient performance The XR80 features up to 80% efficiency. Durable construction Materials for all components are tested again and again for long-lasting performance and reliability. Better indoor air Add a Trane Air Cleaner to your system for filtering that removes more dust, pollen and other irritants throughout your entire home for a cleaner, healthier, more comfortable home.