In a NJ climate the condensation would be truly excessive.
Mid-summer dew points in NJ are in the high 60s/low 70s Fahrenheit, and to get reasonable sensible (temperature) cooling you'd need to run radiator temps well below 65F, probably below 50F. Even if you could make 35F water efficiently and cheaply, it's a lousy solution in your location.
A far better solution would be a modulating variable speed high SEER ductless mini-split (heat pump, or AC-only). You can do quite a bit of cooling with a $2000 3/4 ton mini-split air conditioner- it'll run almost constantly (since it modulates with load), taking down the humidity, so even when it's not keeping up it'll be comfortable due the the drying factors. Unlike central air, it doesn't make pressure differences between rooms to drive air-infiltration (sucking in more humid air), and they're far quieter than window air conditioners since they use scroll compressors in the outdoor unit, and variable speed fans/blowers on both the interior & exterior units.
The up-charge for a cooling AND heating version is typically a couple hundred USD, and in heating mode the operating cost is comparable to condensing gas ( and WAY cheaper then propane, oil, or resistance electricity.) When used to offset oil or propane use, a high efficiency mini-split typically pays for itself in under 4 years. Skim this document for a
discussion of the economics and environmental aspects of heating with heat pumps vs. fossil fuels and other alternatives.