It’s interesting that you have aux heat for your geo system. I didn’t install any aux or backup, my thinking was that my heat exchanger was going to see 55 degree water regardless of the outside temperature. And that has been the case for almost 40 years now.
Mine is an open loop though. Is it common to add aux heat to a closed loop system? I have little experience with them.
Closed loop will not maintain 55, it can get below freezing, so I have glycol in the system.
But, the longer the system has been in the ground it seems to do better, with little need for backup. A one night drop like last night is one thing, a week in the teens every night will probably require it.
Reminds me, I bought refractometer to check my glycol.
I have 2 independent geo systems, 2 ton upstairs and 3 ton downstairs. Based on manual J. Think guy who did manual J screwed it up (me).
I should have reversed them. The 3 ton barely gets to 2nd stage. I installed the heat element, but never ran power to it. It definitely did not need it.
The 2 ton upstairs does most the work, hotter in summer and colder in winter. It uses backup heat only if outside gets into low teens.
I have monitoring system that I haven’t looked at in months.
The 3 ton loops are at 55 but it’s not running. Upstairs loops around 45.
