My wife and I are enclosing a porch to create a bonus room. The existing house HVAC system is not enough to handle this additonal square footage. Option one is to put in a new unit capable of handling the entire house. Option two is some type of wall unit. Our contractor is recommending a $3k unit. I feel that is WAY too much. Apparently it seems to be some type of mini split. What other options are out there? Where are some good places to look at units online? We're looking at about 300 square feet with a 10' ceiling. I just can't help but think this is more of a unit than we need. I would like a thermostat and it to be somewhat quiet, and of course relatively efficient as it will run a fair amount as this will become our home office. Thx for the ideas and suggestions!