Converted a screen porch into a sunroom this winter. Assumed (first mistake) that it would hold heat well and therefor need only one duct line run from the house to keep it warm. well the mornings are cold for the owner. The therm. in the houseworks for the house, but  not for this new room. She wants a heat/cool unit stuck in the wall. Im trying to avoid it, mainly , I think she will complain about the noise. She ll crank the a/c in the summer for sure; there is one slider and an awning wind to keep are moving. It will get hot. Any alternatives that are less than $1500.? The room is about 200 sqft.  any responces would be appreciated.