If cracked, combustion vapors will get blown into home circulating air, like if a radiator has a leak the fluid will spray out slowly, right. 

Your order of priority is transmission, engine, air conditioning.

I would need my cash to be more fluid than what you have explained.

If you do replace the windows, compare based on STC rating (sound transmission class).  

Similarly aluminum wiring is commonly used for your utility distribution and transmission lines in large part because it is much lighter which makes the long runs between poles easier.

Granted she's high use (home all day, walker/wheelchair etc), but we found that it wasn't really waterroof, and allowed fluid to seep betwen seams (dog pee).

Real Estate is fluid. and always changing for week to week, project to project. know your criteria and your budget.

Being cash fluid allows you to buy properties that need TLC so you can renovate and get out more cash on the ARV.

Since it was put on we have had oil and hydraulic fluid leaks and it didnt take.

Any solid or fluid (such as water, steam, air, or flue gas) which is used to convey heat from a heat source (such as a boiler furnace), either directly or through a suitable heating device, to a substance or space being heated.I don't know what kind of system you have, and their information isnt enough for me to understand the scope of work.