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I have a Boiler and mixed Hydronic system installed and running nicely in my house for a couple of years now. I have in-floor pex on a couple of floors, some rads and domestic HW coming from a new Natural Gas modulating Boiler, and an old 96% gas furnace (with Variable Speed motor) for some remaining forced air and AC in the summer. I installed a separate zone with pump for a future Air Handler during the time of the original set-up. I am currently wanting to de-commision the old gas furnace and set up a new Air Handler with Hydronic Coil and a new ACoil for summer AC.
My thought is this...
I might get a couple of hundred bucks for the 5 year old furnace and then spend 10 times that on a new Hydronic air handler, but could I not just remove the entire heat exchanger from this furnace and install a coil in its place? These coils seem to run a few hundred and I would be re-using a perfectly good sheet metal box and motor rather than (likely) sending it to the dump.
Obviously the control panel will be of no use but can I not set the fan speed to low and have it run at the same time the Pump controller starts the pump, when the thermostat calls for heat?
Has anyone done anything like this?