For Arizona homeowners adding insulation to your garage is an unnecessary home upgrade because adding insulation to your garage will not save you money on bills. Yes, insulating over your garage will lower the temperature of your garage and of course, if you have rooms bordering your garage or above it then that garage wall should be insulated. Insulating the wall that separates the room and the garage will protect that room from being effected by the garage’s temperature and 100% of the homes we have performed energy audits and thermal camera scans on do have insulation in the adjoining walls.
If insulating your garage is more about comfort and less about savings then we completely encourage it! If you’re one of those people who enjoys working in the garage then insulating the space might be a good idea. Insulating the garage will help you keep the warm or cool air inside without it escaping and being influenced by the outdoor temperature. In fact, we have even put swamp coolers in garages to really circulate the air in the garage. Evaporator coolers are the most cost effective way to cool the garage but if you want to fully condition your garage with a ductless mini split, we recommend fully insulating the walls, ceiling and garage door panels in conjunction with installing min splits. We have installed mini splits without insulating the garage and it becomes much harder to keep the conditioned air in the garage if it is not insulated and the mini splits needs to be grossly oversized.
Some homeowners will insulate their garages during construction because they know that they’d eventually like to turn it into a bedroom years down the road. This is a fine idea as long as you’re using insulation that will not deplete over time like microfiber or spray foam.