But if you’re choosing an HVAC system for new construction, or you’re considering switching to a different system, it’s useful to know about the available options. If you don’t have a furnace, your heat pump will be connected to an air handler. Furnaces heat air and distribute it through your home using a blower and a series of ducts. There are a few types of furnaces – gas, electric, and oil – but they all operate on the same basic principle. While installation costs can be high ($10,000–$30,000), geothermal systems last 25+ years and require less maintenance than traditional HVAC setups. They’re ideal for homeowners looking for a long-term, eco-friendly investment.