Have a 5 ton air handler with a 4 ton condenser. Off my supply plenum I have 3-6", 1-9" and 1 10" flex runs I know they are too small. Will replaceing the 9 and 10" runs with 2-12" runs be enough so I don't restrick this handler

have a 5 ton air handler with a 4 ton condensor. Off my supply plenum I have 3-6", 1-9" and 1 10" flex runs I know they are too small. Will replaceing the 9 and 10" runs with 2-12" runs be enough so I don't restrick this handler

Here it is. Do the sq in calc on the flex to get the sq in needed for the tonage.

Thanks, I did light service work long time ago but not much duct work. Got some attic work to do!

One more question, I'm way undersized in the supply ducts. Will that cause the 24 degree temp drop I'm getting and some frost on the suction line?

One more question, I'm way undersized in the supply ducts. Will that cause the 24 degree temp drop I'm getting and some frost on the suction line?

That could be one of the items to cause that.

Thanks, borrowed a leak detector, no leaks found, thought the airflow restriction might be the cause. Didn't notice this summer with 95+ degrees every day.