I use a combo washer/dryer unit that is electric and requires no venting (everything is condensed to water and drained out through regular plumbing).

Each unit would need its own outdoor condenser.

There really isn't a huge difference between windows, doors, HVAC, mechanics, electrical, or plumbing from homes ranging from 900-1400 square feet, these don't really multiply until the home gets big enough that you need 2 electric boxes or 2 condensers/furnaces, etc.

These are AC/Heat electric powered exterior condensers with interior wall units.

As they were moving in someone did something to the electric meter killing the power to the house and then they stole the AC condenser with the tenants in the property.  

My realtor had an AC condenser stolen in the neighborhood. 

Some of the windows are rotten, and there are sliders where condensation is on the inside so those would need to be replaced.

Understand that when buying cash your only advantages are speed and simplicity/lack of appraisal -- therefore try to keep your timeframes in the contract as condensed as possible and make your contingencies few and far between.

I'm just not techie enough to call up past posts that address this area of RE, sorry, I guess it will need to be condensed into a blog so that every time the same types of questions are asked (which seems to be at least every week) they can simply be addressed to some blog.

The "leak" is the normal condensate that is removed from the air during the cooling process.