I have a 3 ton system with 4 loops 600 foot each. Two 300’ trenches 3’ wide 6’ deep loops go out then up two foot them back. This is our first summer with geothermal we are in the south just outside Greenville SC ground temp 6’ down about 56 degrees. We started out the summer with a couple week heat wave some days were 98-99 degrees. The system did great and never had to kick on stage 2 until it is around 96 outside. My loop temp cools some over night and now it is getting up to about 80 degrees. LWT-EWT is about 9.1 degrees difference. I have one pump Grundfos UP2699FC pressurized system and have set it to medium for the summer. I guess I was wondering if loop temp 80 degrees was normal. It seemed to go pretty quick from winter loop temp to summer loop temp. Yes, we did have a heat wave for a couple weeks. I just have nothing to compare it to all the public data for loops I could find were in the northern part of the country. They might just start using AC. It is working really well the house is very comfortable and the humidity is being controlled well. We have solar power banked 1,000 KWH to use this winter for heat. Is there a loop temp that I should be concerned with? I guess I expected the loop to stay cooler than 80 degrees at this point in the summer. But I have nothing to base this on other than knowing the ground temp at 6'. Other horizontal loop systems in the south what are your loop temps?