I'm starting to look for a new furnace & whole house A/C. My old gas Lenox furnace has held up well & is still working fine after 57 years but I looking to replace it with a more efficient as well as the bunch of window A/C units I currently have. One area that may be a problem is that 18 years ago I had an addition put on but at the time didn't run duck work to that area. Just have a in wall furnace to heat it. I'm looking for suggestions on what to look for in a furnace (brands, models, accessories) & A/C unit, questions to ask a contractor & is there a way to have the A/C to to my addition since there isn't any duck work??? I'm guessing the furnace & A/C from others I've talked to will be around $4,000 to 5,000 for the Pittsburgh area, any help on what to use for the A/C in the addition & approx cost for such thing. Thanks in advance to anyone that responds,
Al