I'm in the process of purchasing a new HVAC unit, I've had about 6 contractors come out and I've recieved a number of different opinions on what to do about the room over my garage (my master bedroom) which is constantly varies in temp by about 10 degrees. If it's hot outside it's 10 degrees hotter & humid in this room, if it's cool outside it's 10 degrees cooler.
To give a little background the home is about 1825 sq ft. It's 2 story and was built in 2001. The current HVAC system is a 3.5 ton (after a manual J I've been told that it should be 3 ton) goodman with a non-variable speed blower. The garage is finished, the ceiling above the garage is insulated (not sure how well because I can't really get a good look at it), and the garage doors are also insulated.
The room where I'm having difficulty is above the garage, it has 5 windows that face a western direction, and another 3 that face south. The ceilings are vaulted which provides less insulation room than the rest of the house. The room is roughly 16x8 and has 2 small vents.
While I realize putting in foam insulation in the garage and insulating the ceilings in the room better than what they are now might provide me better comfort in the long run, the coil in my AC freon based A/C system is dying which means the expense for a repair/replacement on this is something I can't avoid. Better Insulating the area would add an additional cost which I simply can't afford at the moment.
So onto the options the contractors have provided me.
Seems to think that a variable speed blower is going to solve the majority of the problem for me. He's going to install dampers in the trunks of the system to allow me to better control the air flow to the room I'm having problems with. He also intends to take the square part which comes out from the coil (where all the vents branch off from in the attic) and turn it into a round peice because this will get me better air flow.
Also seems to think a variable speed blower is going to solve the majority of the problem. He intends to add another vent to the 16x8 room and an extra air return in order to solve the problem.
Intends to install a variable speed blower, but thinks that Zoning is going to provide the best solution to the problem. He intends to zone the entire upstairs. (Keep in mind that the upstairs as a whole is not an issue just the room over the garage).
So I'm looking for some input on this subject. Any thoughts?