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Yes, they drilled through a cinder block and a brick wall to do the venting for the furnace. I think the concern with the A/C lines was going from the ground floor up through the wall to the...

Thanks for your input. FYI, the new A/C uses 410A. I have no idea what the manufacturer specs are.

I am replacing the furnace and A/C in my home. This was precipitated by a leak in my A/C. I needed 3 pounds of freon added a few months ago. Very expensive! Both the furnace and A/C are...