Tenant caused mold from leaving unit humid, who pays?

[Zach Nelson]

I have a tenant who lives in a walk-out basement unit in central IL.  She rarely runs her heat and hasn't used the A/C once in the two years she's lived there since being sunken into the earth keeps the unit fairly comfortable.  The major drawback to this is it stays very humid during the summers down there, also due to it being a basement unit.  I verbally warned her when she moved in to make sure she ran the A/C periodically to keep it dry, but she hasn't, and recently she found mold on a lot of her shoes and clothing.  I paid to have a mold inspector come out and while the spread of the mold wasn't severe, their proposed remediation is $2,000.  

The other catch is she is moving out in a month.

How do I handle this?  Do I bill the inspection fee ($200) and the remediation to the tenant?  She tried to run the A/C for the first time now after the inspection and all the refrigerant has leaked out (it was working when she moved in, not sure if it failed from sitting dormant), so that's also going to require a $2000-4000 repair after we find the leak.

Any advice is appreciated!

[Wesley W.]

I think at this point you have to foot the bill and chalk it up to "tuition."  Going forward, tighten up your lease.  Here are two items from mine that deal with your issues:

14. PEST CONTROL: Your rental unit has been inspected and deemed to be pest-free. If you have a special problem with pests, notify the Property Manager. You are asked to assist our pest control by maintaining a high standard of good housekeeping. If the sanitary conditions in your unit are such that it attracts pests of any kind, and it becomes necessary for us to undergo remediation in the building, you will be held financially responsible for reasonable costs thereof, paid as additional rent.

18. MOLD: You must take steps to limit the growth of mold in your apartment. This includes operating your heating and air-conditioning system as appropriate to reduce humidity, using appropriate ventilation, limiting evaporation of water, promptly removing any visible mold, and immediately reporting to us any leaks or other water intrusion into your apartment or any visible mold that you cannot remove. Household furniture must be positioned and/or elevated to allow adequate air flow underneath and between furnishings and adjacent walls.