Hello,I would like to put down laminate/wood flooring in one of the houses I own once the current tenants move out.The carpeting that is currently in place is on it's last leg, and the tenants have pets so I expect the condition upon their move out to require replacement anyways.My question is: may I use the portion of the security deposit that I would have used to purchase new carpeting towards the purchase/installation of laminate/wood flooring?

You will also have to install a chimney liner.  

If buyers want granite, hardwood floors and expensive imported Italian tile, you can't expect to get away with composite counter tops and vinyl flooring.Personally I would be much more concerned about the later if I was in a very small  market or a far away market.

Go to a big box store, buy off the shelf cabinets, have someone install them.

They are also simple to use and easily install like regular house locks.The biggest CONs are their durability and dependability.

My friends furnace was somehow installed so all the cold air returns in the center of the house blow air and the vents on the outside walls suck the air.

good question @Barshay Graves  ... i was a plumber many years ago and replaced a lot of galv. back then copper was the best option... these days pex pipe for water pipe is so easy to install plumbers are installing for less and makes a huge job of repipe not as much of a challenge. get your prices for waste and water replacement (pvc or abs pipe for waste)  (pex for water)  and shop around a bit. 

You want to find someone who will just "tell you what you've got" in that you want to know what the problem is and how to fix it VS what it will cost to have a new one installed.  

Electrical, plumbig, siding, shingles, hardwood floors, ceramic tile, paint... the list goes on and on.

(Unless it was just installed wire a year ago) including replacing an old outdated too small dangerous service box.