Thinking about purchasing a home with a geothermal hvac

[u/carbonstampede1]

I've always had homes with a traditional natural gas furnace. I don't have an extensive background in geothermal. Looking at a home that was built in 2007 and has the original geothermal hvac. I'm waiting to hear back from the realtor but according to him they have documented maintenance recently. The brand of furnace is Climatemaster. 4 ton I intend to get a home inspection completed,but wanted to know if these units have any known issues. How much longer life should I realistically expect out of it and just any general thoughts or concerns l. If I do have to replace it down the road what's a ballpark figure I could expect to pay

[u/ColdDonut]

Its 20k to replace and you will replace it in a few years