Make sure to carve out time to recharge (gym, therapy, whatever works for you) on a regular basis. 

Do they need to be plugged to electricity/water or they can be recharged/refilled?

The refrigerant leak can be the biggest challenge - they must examine the tubing visually for signs of damage, leak-check the joints, coils and tubing using an electronic leak detector, and once they find the leak, the system must be depressurized (pumped into a refrigerant container), the leak repaired, then the system must be evacuated to make sure it holds a vacuum (verify no more leaks), then dessicated and recharged.

So had to re-braze the line, then recharged freon.Incident reported 4pm on a Sunday and fixed Monday by 10:15am.I restated to them this is NOT an emergency, it's strange, the previous owner was a slumlord and didn't fix anything, now that I am fixing everything they turned into cry babies.

I've been quoted $5K to replace a unit and furnace but had another guy recharge it for $130 and it's been working fine for 3 years now.

It always calms and recharges me.

That's a pricey repair, and your tenant probably isn't going to love hearing that - so if you are generally happy with your tenant you tread lightly on this one otherwise they could turn from good tenants to bad very quickly.  700 bones is a lot of $$.I've seen complete AC systems last a lot longer than I could have ever imagined, but seldom do they go without some kind of maintenance or a recharge every couple years.  

Only then did it actually get permanently fixed.Last, but not least, I reported numerous times that the fire extinguishers in my common hallway...which are all required to be checked by the fire department every year...were all three years past their last check date and all showed the arrow in the "recharge" position. 

We found it an excellent spot to unwind, relax and recharge!

I had a condo unit listed for one of them and they just decided last week not to sell after seeing a flurry of bookings on their AirBNB site.As others have mentioned, the middle class might spend less on restaurants and pricey gym memberships during a recession, but they still need to recharge and still want to make family memories with their kids.