The answer to 'how much to replace mini split in Illinois' is that the cost can vary significantly depending on several factors. In general, you can expect to pay between $3,000 to $7,000 to replace a mini split system in Illinois, with most homeowners spending around $5,000 on average.
The exact cost will depend on the size and efficiency of the new unit, the complexity of the installation, the brand and model you choose, and the labor rates in your local area. Larger homes or those requiring more complex installations may be on the higher end of that range, while smaller spaces or simpler replacements could be on the lower end.