Gas and Oil Furnaces MODEL XB90 Dependable, efficient winter comfort XB Single Stage Furnaces Reliable winter warmth shouldn't be hard to achieve. The XB90 is designed to provide dependable performance matched with efficiency so your home, and your budget, are both comfortble as they can be. MODEL XB90 features: Efficient performance The XB90 features a 90%+ AFUE rating. 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.