I recently moved into a condo in Kelowna BC Canada that has a geothermal system for heating and cooling. I have heard lots of rumors how poorly the system cools the units there are 32 units on 2 floors, we are on the second floor according to the maintenance people the unit below us is in series with our unit the cold water inlet for me comes up from their outlet. We have not experienced any issues with it being too hot but I found when we moved in that our cold ware supply valve was closed, so I opened that which helped the cooling. I also notice that our cooling coil was not hooked up in a counter flow way, the cold water inlet was on the fan side. I changed that and saw a considerable improvement in our cooling. Now to my questions - The maintenance person has said the other units he checked are also hook in a non counter flow way. Would it not make sense to have all the coils hooked in a counter flow manner so they work more efficient and this would take burden off the main system? If the unit below me is hooked non counter flow would the water coming to my coil be cooler?

Fan coils are designed as counter flow heat exchangers, so OF COURSE it makes sense to fix the installation error on all units where they screwed that up!

If the system was designed correctly the effects of how the different fan coils on a loop are installed counter flow or not has a negligible (if measurable, with instrumentation) impact on the cooling performance of the other coils. If they are truly in series with the unit below you it'll have a greater impact, but note that the cooling loads of lower floors are lower than that of upper floors, and the duty cycle of the fan in the unit below you will be lower than yours. Only when the fan is blowing would it be delivering warmer water to your coil. When the water is flowing through their coil without the fan blowing it barely changes the water temperature. That's true whether their unit is plumbed correctly or not. If theirs gets re-plumbed to a correct counter flow configuration the duty cycle on their fan will go down. Even though it'll be reducing your cooling capacity a bit while their fan is operating, you'll have more hours of cooler entering water at your coil. If you leave theirs in a non counterflow configuration their fan duty cycle increases, leading to more hours of less-effective cooling from your coil. But as long as the design is correct you'll still get adequate cooling either way.