The answer to 'how much to replace installation in my area' is that the cost can vary widely depending on several factors. In general, expect to pay between $2,000 to $7,000 or more to replace an HVAC system's installation, including the furnace, air conditioner, and related components.
The exact cost will depend on the size and complexity of your home, the type and efficiency of the new HVAC equipment, accessibility of the work area, and labor rates in your local market. It's essential to get multiple quotes from licensed and insured HVAC contractors in your area to get an accurate estimate for your specific project.