I have been running fhp heat pumps open loop, (em031) for 30 years. First one would put out 100 degrees with 58 degree water. And 68 degree air temp input. 2nd one is now doing 95 heat and 54 cool (78 degree input air temp for cooling) I was looking around at other units, as this one will need replacing in the next few years. Im only finding units that will do a 20 degree difference between in and out. Thus, my well is going to run more water through, units may be more efficiant, but running my well longer is not a good option. Am I reading these specs incorrectly on these newer geothermal heat pumps ?