They are standalone and not built in or mounted like kitchen cabinets so they are easy to remove.   

You also have many different styles of indoor units you can install from wall mount, recessed ceiling units, floor mount, ducted and others.

I live in Mount Vernon, WA and am currently stationed (US Navy) in Whidbey Island. 

Here's the essentials:~900 sq.ft 2/2 condo w/in unit w/d - Mount Prospect, ILcurrent tenant signed a lease 8/1 - 7/31, just asked me if he could have out 10/1.$1150/month rent - about average for the area$67k left on a $73k loan @ 5.75%, appraises at around $90 (so 25% LTV) - $900 PITIcarpet will likely need to be replaced after this tenant leaves - had 2 large dogsall major appliances ~7 y/o and in good working orderI bought it in '09 - it was my first home purchase - and lived in it till summer of 2012.  

However, I have about 500 requests and mounting from buyers/investors who would like discounted properties in their city and state.

You could also mount some dummy cameras in obvious places. 

http://on.fb.me/1K3WJDQ I live in Clermont and my brokerage is in Mount Dora.Look forward to meeting more local investors!

Mount a keybox on your rental and place a spare key there.

Here are the numbers:Location: San Fernando Valley (Los Angeles)2bd/1ba - 850sq ftRemaining balance: 314,000Zillow estimate: 676,400Redfin estimate: 713,749Rent Zestimate (Zillow): 2771 (I feel this is a tad high for such a small house)Cons of the house:Old roof mounted package unit, that eventually will need replacing (made in 1999)Still need to repair 4 sides of fencing repaired/replacedDriveway needs a slurry job1 hour drive from my current house with no trafficLawn needs a redesign (more drought tolerant stuff) - It gets very hot in the valleyPros:Mortgage is only 1760 all inPotential ~900 net/moI already have it...If I did sell it, I would like to buy something closer to where I live, but I also don't want to get dinged with any unnecessary taxes either. 

@Alex NameishiYou can just buy lights with integral batteries and mount them in place of an existing light in your hallway.