i currently live in a small 1000 sq foot house. Would i be better off just using 2 through the wall units? The lr/dr and kitchen are all open to each other and about 600 sq ft. my thoughts were just install a nice big unit for the lr/dr kit. and a small unit for my bedroom. I would leave the 2nd bed and single bath alone. What do u guys think? I ould save alot of money.any thoughts?