"That dent was already in the refrigerator".

Refrigerator, stove, washer/dryer. 

Dont turn the water on at all until you can get in the house. and then have people stationed on each floor to listen and watch for leaks.OMG what a RISK. even with a house being properly winterized by a so called professional company things fail.Just to mention a few,, outdoor sill cocks.. dishwashers,, ice makers in refrigerators, washing machines, and radiators. to mention a few some forget,  any and everything that's had or supplies water in it is potential for a leak and you won't know till your there and turn it back on.When you do turn water on DO it SLOWLY,  have faucets open and as water starts running and air is forced out then turn off each faucet.

It is not a good idea to have ice makers/water feeds to refrigerators in a rental..

Was wondering how much would it cost me to upgrade doing this:- new paint through out- new appliances (refrigerator, range, stove, dishwasher, washer/dryer stacked)- new carpet- two and half baths remodel- kitchen cabinets new paint and new handles- new blinds through outThe rent around the area is about $2600.My questions are:- how much would I spend if I do all that?

Central air systems contain freon type gases (refrigerants) that cannot be discharged into the air, so you should not play with that unit unless you are qualified to handle the refrigerant properly. 

This home offers a New Roof, New Electrical, Newer Windows, New Oven/Range, New Refrigerator, New Kitchen all around, New Bathrooms, New everything!

This home offers a New Roof, New Electrical, Newer Windows, New Oven/Range, New Refrigerator, New Kitchen all around, New Bathrooms, New Doors, Fresh Coat and Professionally Painted Interior, New Hardwood and Carpet Floor throughout, New Landscaping, Newer Everything including lights, fixtures, cabinets, handrails, toilets, tubs, sinks, doorknobs, bulbs, trim, and more!

., pictures of the filthy oven, refrigerator, etc.) to justify the need would be useful should the tenant refute the amount kept out of his deposit and this end up in court.

Installed a new refrigerator and stackable washer / dryer.