Originally Posted by
mcgahat
.........The problem is that the whole facility is either AC or heat. This time of year, it is heat. So, you can turn that thermostat down las low as you want but there will be no cooling coming out. I am assuming it is still on heat at the moment............
This type of dual-pipe chilled water HVAC system is quite common in Europe as well as in older NYC buildings. The entire building, or complex, can only have either heat or A/C but not both. The transition season is always difficult to nailed down yet it is often in May (heat to A/C) and October (A/C to heat).