New ac ducted on top furnace install 2.5 ton ac. Outdoor ambient 16 Celsius, 410 a, low side is 32 degree faranheit .High side temp is 70 degree faranheit . 14 foot of lineset, so we added 5.5 ounces to try bring up the low side, but it wouldn’t come up. On the cusp of freezing. Supply and return upstairs is a split of 15 degree f, and the delta t across coil is 18 degree f. Sub cool is 6 f. Any ideas ?

Posted by rockyourpipes at 2025-06-05 01:35:34 UTC