It's a two family so both furnaces I want to change but since I have duct work I would get a unit for both ac and heat.

For example, in one of our properties, an older duplex, we recently had to replace both AC units as well as some ductwork to the tune of $11,000!

Doors (interior): est 15 doors, 2700Windows (18): 7200 (real bid not estimate)Drywall: 13000Painting (interior): 8100Electrical: bids from 11k-21k includes all fixtures, outlets, etc…Plumbing: 11k-18k (including new water service 1” pipe, and all fixtures)HVAC: 22k (new systems, new ductwork) This also seems high to me, thoughts?

Several of the source properties need new heating and a new central AC including duct work. 

Pay roughly $6,000 per unit ($18,000) total to have ductwork and brand new 1.5 AC units installed outside)2.

So we put in new heating and cooling plus duct work, brand new kitchen all new laminate flooring plus a third bathroom.

It might be that the moisture is coming from ductwork that's not insulated, since it is in an attic.

Hello,I bought my property 3 months ago. Two of my vents arent getting air pushed through them from the AC unit (7 other vents are working fine and receiving air and the AC system works fine). The ducts are in the cei...

Many people automatically think electric resistance baseboards (or electrical coils in a central air-handler), but your ancillary heat could be easily fuelled with natural gas, propane, oil or another fuel.Presuming your use of "furnace" means a forced air furnace and not a boiler and hydronic heat, you have the option of adding a heat pump with an exchanger insert in the plenum of your existing ductwork.  

The tree has caused extensive damage; beams are coming down through the ceiling, the AC is leaking, duct work is coming through the ceiling, roof is damaged, etc.