Gas and Oil Furnaces MODEL XL80 Gentle, even heating for consistent comfort XL Two Stage No matter what the temperature outside, the XL80 is designed to provide a consistent, predictable flow of warm air to keep your family comfortable all winter long. MODEL XL80 features: Efficient performance The XL80 performs at 80% efficiency. Flexible heating Two-stage heating helps prevent temperature swings. 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.