Attic fan replacement
Have a whole house fan that is 15 yrs old. Installed in hallway ceiling on 2nd floor of 3,000 sf house. I have been told I have big leakage through the fan grll and should either replace fan with one that provides good seal or ditch the fan and just seal the grill space. I am in the Midwest and maybe use the fan 20 days before have to use ac.I am guessing the cost differential between new fan or fill-in is $500 range. Is there much savings over ac usingthe fan?