id go with steel siding windows not sure, I have a minkota double hung windows in a new house a pair right over my bed and in the winter not impressed with the cold that comes through.
I have hot water floor heat in a 30x40 and the boiler had the option for a hot water heater that I hooked up to a heat exchanger on the ceiling. separate thermostat and works great to heat from 45 to 65.