Adding ducting to cool garage
My home has 770sqft of conditioned space. 2T Trane condenser with 45k btu gas furnace. I'm in Central Texas(HOT) and the AC has always done a great job of cooling. For years I've thought about adding one or two flex ducts(10') to the one/two end of the line registers to cool the attached 1-car garage. Garage get oppressively HOT in the afternoons. I'm retired now so using the garage is important these days. Garage is 250sqft w/8' insulated ceiling and 3 insulated sheetrock walls. Wood garage door w/seals on all 4 sides. Garage situated East side of house w/door South. Workable idea? Problem having no return-air?
(Only other solution is cutting in a 110v ES room unit on the blank East wall, but I'm thinking the HOA would not approve. No room for unit on North wall due to electrical/plumbing in short wall. Portable unit is out of the question...takes up too much room in small space and they are way expensive to buy/run.)
I use a Dearborn 20K btu gas space heater to heat garage. With very low flame, it heats the garage to mid-60s from low-40s in about 1hr.