Garage Conversion and HVAC

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What is the best way to bring heating and cooling to an attached garage? Our HVAC is being replaced, and our large family needs the garage for living space. Wed be going from 1500 sq feet, to 1900 about… Its HOT here in summer, and COLD in winter. Portable, wall, and window AC and heating units don't cut it. The walls have drywall, but no insulation. I have a roll up door with no insulation, and a slopped roof with no insulation. We have contractors coming out to talk to us about replacing the HVAC and I want to ask what they can do to the garage. If my children have to use it for bedrooms as they get older, I want the AC/Heat to work just as well as the house. Any suggestions?

Best Answer

Converting a garage to a living space means applying all the features that you'd normally expect in a living space:

  • Remove the rollup door and frame in the opening (or frame a new wall with an offset to create an externally-accessible storage space, as Ed Beal suggests). Install an insulated service door or window if desired.
  • Insulate the walls and ceiling and apply vapor barrier.
  • Run supply and return ductwork from the new HVAC system.
  • Consider framing a floating, insulated floor over the slab

I think that you knew this was the answer but were looking for shortcuts. You've eliminated the shortcuts in your question by saying that window units don't do the job. I'm not surprised, and I'd be wary of the energy bills even if that was a workable solution.