I am getting ready to rehab an older duplex to keep for rental. Because of its age (85 yrs.), it doesn’t lend itself well for central a/c due to no access to run ducts. Has anyone used the mini ductless systems or through the wall? What do most of you use besides window units? The duplex came with two large space heaters that I assume put out enough heat for up and downstairs. Any suggestions on cost effective solutions would be appreciated.
Mark