House cooling problems - MD
Moved into older home in 2003. Immediately started having heating/cooling issues all over house. Replaced HVAC last year. Insulated ducts this year and repaired lots of holes (outside and in), put attic fan over garage (have 3 in house). They run 18 hours per day, sometimes more in the summer. No insulation in the attic over garage, sofits look like bird holes, no ridge vents (have 2-3 yrs left on roof), 4 different roofs...we don't know where to start, who to listen to; know we have to insulate, but with what! Please help!