We have a cold spot in our house when using the gas furnace. Since I’m switching to the boiler using the furnace blower and water to air exchanger I want to take care of the problem. It’s the entire second floor. It’s nive with the radiant heat from the wood furnace but seriously lacking with the gas. https://www.heatandcool.com/downloads/dl/file/id/800/product/6066/awuf_series_installation_manual.pdf I’m thinking about this and tying it into the trunk line on the second floor to boost heat upstairs and allow separate control up there. Just add an exchanger like I will above the furnace. Think this might work?