When we built our house, (abt 8yrs ago), we built in an "airplane room" 16X20 in our finished basement. Has worked out very well and the temp is always the same as the rest of the house. Air in the summer and heat in the winter. Only problem was when the sump pump failed abt 2 1/2 yrs ago and flooded the entire basement w/ 12-14" of water. $30,000 later it's good as new. we have had birds as large as 42%, (2 at once), in the shop. Just have to be careful when taking them up the stairs.
Steve