A two room addition on the 1st floor has limited attic space and a 4 crawl space.
Forced air system in attic.
The trick to the installation of a gas furnace in an attic space is routing the condensate drain from the attic down through the core of the house to the basement.
However i have two questions if i want to centrally air.
Since most homes have their hvac system serve multiple functions at once it can be cheaper to install the unit in the attic because the roof access can make inspections maintenance and repairs at lot easier.
Heat pumps and ducts are part of it too.
Our house is a 2 story forced hot water system without ductwork.
It s expected that the air will come through the soffit vents into the attic space but that s not always the case.
Forced air systems are usually the cheapest ones to install in homes today and a furnace qualifies as this type of system.
It s easy to see your point about eliminating ductwork from the attic.
So why put an hvac system up in the attic at all.
Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts.
It also hard to predict where exactly the new air which is replacing the air forced out by the ventilator will come from.
A basement is below and an attic is above the main part of the house.
Typically this indoor unit gets placed in a cabinet or closet somewhere inside.
There are rarely instances when we will advise against an attic installation.
If you don t have forced air the fan and coil system is typically placed in the attic where it will deliver cool air through ducts.
The 20 to 30 foot long pipes that carry the refrigerant are disguised to look like a downspout.
An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan.