i want to put in a hyrdo system with aoil fired boiler. the house is 2 floors 1000sqft each level.first question i want to put the air handler in the attic on the second floor. i was told i will have to put anti freeze in the system. i live in the n east and it can get cold. secondwhat size circulator would i need for each air handler. and last should i get a tankless coil and maintain temp or get a amtrol and get a cold start. any info and help is greatly appreciated