Debt on depreciating metal has no place in wealth building. 

Just a regular wood stud wall with maybe metal siding to divide the rooms.

Any particular material you would recommend for the doors such as types of wood, sheet metal etc? 

Once completed we go ahead and remove the water tank, A-coil and condenser unit and store away for safe keeping's.

@Ram V.I do Hvac for a living, usually the bigger the company the more they will charge , take into account equipment brand , the size of the condenser seems about right for the square footage of your home , usually 2 stage furnaces are more expensive I would go with single stage you won’t be saving that much money anyway , ballpark pricing on the equipment would be 1400 for condenser 400 for coil and around 800 for a single stage furnace , that’s cost remember contractors raise the price of the equipment and of course you gotta pay somebody to install it right .

The original tenant met all of the checks,. good credit, 4x income, no evictions, no criminal record.pay the squaters cash for keys to get moving on the repairs or evit

Bracing gets set into the footing/slab of the basement if done properly and then usually 2x6 (i believe) and it's a metal beam up the floor joists. 

Sometimes boilers have coils in them that control domestic hot water as well so shutting off the power to unit may not be best idea. 

Typically sheet metal sides and back and in rural to weak suburban mid-block locations. 

It met all our our criteria (except being in Alabama) and the price, taxes and location were right.