So we are looking at buying our 1st house and found a really nice one in our budget but it does have some issues. The biggest issue is there is a mostly finished bonus room over the garage that isn't counted in the house square footage,not sure why it isn't counted. The room is probably about 24x32 is (sits above a large 2 car garage). The house is a 1928 cape cod that has been renovated and does currently have central air for the whole house (2310 sq feet). The garage is connected to the house by an enclosed walkway. You come out of the hallway by the kitchen and into the walkway. You have about 4 steps down to the garage door or about 10 steps or so up to the bonus room (think kind of like a split level). They currently are using space heaters and window air conditioners up there. What would be involved in running central air/heat to that room? Would it be simpler/cheaper to put that room on its own system or enlarge the current house's system to handle it? How much money does something like this usually run? I am not looking for exact figures, just trying to make sure that this isn't something that would get us in over our heads on a house that is at the top of our price range. There are other little projects the house needs (ie double pane windows need resealing) but nothing major pending an inspection. If you need pictures of the house to help, I can post a link to the MLS listing if necessary. Thanks for any advice on this.
Why yes, yes there is an HVAC specialist here. I've got almost 20 years in it. What you want to look into is a Mitsubishi ductless system. There's two parts to it, an condenser, that sits outside the house, and a small unit that hang up near the ceiling on you wall inside. It looks kinda like a small window a/c.
The package is actually a heat pump, and is used for heating and cooling. These things are CRAZY efficient. I'm talking pushing 20 SEER.
There no duct work needed. The two units are connected by two small copper lines and some wiring. You can actually have zone multiple rooms OS's of one condenser. To do one room, I would expect to pay in the neighborhood of 6k. Give or take depending on you local market. If its in the budget, its worth every penny.
Ok thanks this is a lot of help. It at least gives me an idea if what I'm looking at. My sister is a civil and architecteral engineer so she is able to provide some guidance but doesn't really specialize in this area.