Our two car garage is 18' x 19.5' and though I'd like to park our small car in it I also want to build a work area for a computer, some books, ham radio gear, treadmill, and some other gear which we just have no place for in the house. I thought about building a small room within the garage, which still may happen in time, but given our city has some crazy building codes I don't know if I want to tackle that just yet. So for now I'm looking at options to insulate and seal the garage door, walls, and ceiling plus getting some cooling and heating setup.
For insulating the garage door I've seen the Owens Corning Garage Door Insulation Kit which would get the door itself insulated, but any suggestions on how to make the door seal completely around it as to not let bugs and critters inside? I've seen things like the Park Smart Garage Door Threshold Seal which seals the bottom, but what about the top and sides? Our house is only a year old so it has the rubber seals there, but would that be sufficient?
And for insulating the walls and sealing, I'm still kicking myself for not having the builder insulate those when we had the house built, but it shouldn't be too difficult to put some insulation in the attic, but any caveats with leaving the walls uninsulated? Two walls are inside walls and one is the garage door, so it's mainly just the ceiling and one wall I have to worry about.
For cooling and heating I'm looking at a portable AC/heating unit to put in there, which I've seen for around $400. Even if I have to run a line out the wall for condensation this is probably our best bet. Also given the garage isn't sealed as well as the house are there any caveats to running a dehumidifier when the garage door is closed?
And for the floor I'll probably look at painting it with some epoxy floor paint or some rubber coating then use indoor/outdoor carpet around the area where we're not parking then keep a mat under the car for fluid drips.
All and all I think we can probably pull this off for $1000 - $1300, but what am I missing? Also has anyone ever done a similar setup? I'd love to see pictures or hear what you went through if so.