We live in northern Delaware. Just had a 12'x18' gable-roofed sun room added. House has oil forced air heat and central AC. There will also be a wood-stove installed in the addition.
Summers here are hot (many days above 90F and very humid) , so cooling is primary. So is a quick way to take the chill off the room (until the wood stove kicks in), to make my wife very happy.
She got an estimate for extending the house system into the addition. Because of the way the addition is built, vent placement will not be optimal. Second option the contractor mentioned was a Sanyo heat-pump. But there will be refrigerant lines visible and (I guess) a pad-mounted compressor/exchanger. Not lots of room next to the house. I am thinking a roof mounted heat pump, something like in an RV. Does a unit like this exist, and would it be a viable option? Any suggestions welcomed, and thank you in advance for your assistance.