Level 9 Heating & Cooling provides furnace installation in St. Louis and Washington, MO. When you’re ready to switch to a modern, efficient system, we’re the HVAC company in St. Louis and Washington, MO to call. We have decades of experience and have served area residents for many years. We are familiar with today’s top brands and models and can help you choose a furnace that can keep your family warm and comfortable all winter long. Furnace installation can reduce your heating costs by up to 45%, thanks to advancements in HVAC technology. Additionally, today’s systems are much safer for the environment. The lowest efficiency required for furnace installation is now 78% and many options allow you to achieve nearly 100% efficiency.