The garage should have a drop in already there. It should be like the bedroom AC not like the middle one. The middle on has the heat pump option, you can add a heat pump to the garage AC. Frankly heat in the garage is the issue. Below 45 degrees the heat pump doesn’t heat. We use a propane heater in garage.
2015 F-450 XLT 440 HP Power Stroke 26.5K Custom Resse F/W, Manual Regen, 19.5 Rubber
2014 Oreion Sand Reeper 4x4 Toy steel everywhere, street legal and licensed, 5 speed manual, 3 cylinder DOHC "Chery" engine and 2 door fun.
2015 Jayco Sesimic 4212 Extreme Weather Package, Dual Pane Windows, Side and rear Patios, 480 watt Zamp Solar Pkg 6 AGM batteries, Residential Fridge, custom Dishwasher, 5500 watt Onan and lot of problems.