What is the best way to air condition my garage?
It is against code to place ductwork off your house's system and condition the garage. This code protects you and your family from having deadly carbon monoxide gas from your vehicles or Volatile Organic Compounds (VOC's) from your paints and fertilizers from going into your living space. Even if you only did a supply register and no return, you would make your air conditioning system go negative and it would start to replace the air you took from it with air from the attic, outside, or the garage. Once again, you have completely compromised your house's air quality. The best solution is a separate system. We find that most customers prefer a split ductless system. It is very energy efficient, pulls out a ton of moisture, and is very quiet. The evaporator mounts on the wall and you have a point and click thermostat. The condenser usually goes on the exterior part of the same wall.