Hi so my duplex that I just bought needs an upgrade with the HVAC unit, I am replacing the window unit and electrical radiant heat with a central ac, i got a bid for 7.5k wanted to know if that is a good bid for new HVAC unit, duct work, heat pump and installation?

Some furnaces have the cooling coil inside the furnace, sometimes there is an AC cooling coil installed in the ductwork downstream of the furnace air handler.  

. $9k for both sides is not outrageous, however it's a tad steep for Florida - unless there's copper replacement, ductwork, etc.

Any Milwaukee landlords have an idea the cost range of running furnace ductwork to an upper flat?

You can add central heat and air, but it will be very expensive because the you have to add all the duct work.  

Sometimes there are dampers (I think that is what they are called) that can block warm air from going down some legs of the ductwork. 

A furnace and central air can be had for a very reasonable price,,,IF duct work doesnt need redone!!

It is not uncommon to enter a crawlspace in the south and find water pooling on plastic from humidity condensing on the exterior insulation of forced air duct work.  

But update and good news:  we found out we could use our HVAC unit from the former property after all, and it will cost less than $2000 to have it installed with all the ductwork.

.-1-ARUG42C14A Air Handler-1-GSX13042 Condensing Unit (3.5 ton - 13 seer)-Disconnect and remove existing air handler in closet-Install new platform and seal return air chase-Reinstall existing air handler-Repair wiring and reconnect ductwork-Install new refrigerant lines-Remove existing condensing unit-Install new condenser listed above-Reconnect electrical to equipment-Restart system and check operationTotal - $5,450Please let me know if you guys think this is reasonable or if anyone has had experience with this.