The cost of buying a furnace and AC unit can vary widely, typically ranging from $4,000 to $10,000 or more, depending on the type, size, and efficiency of the units. However, these AC and heating systems can offer long-term savings on energy bills, which can offset the initial expense. The total cost will depend on factors like the size and type of system, the complexity of installation, and any additional upgrades you select. At HVACDirect.com, financing options and rebates are available to help make the purchase that fits your budget.