Airline companies have taken note of the growth and have added two non stop flights to Europe.

take the covers off the baseboard heat registers and vacuum out the between the fins.. might help also.. people never think to do this and it really helps.

Upon move in, she had a 3 page list of requests.These included new:New vacuum cleaner bags for a vacuum which was already in the house.A wooden strip added to the front door as she thought the gap was too wide.New electrical outlets for the whole house as the existing ones were old.There were some valid requests which I fixed straight away (AC wasn't cooling below 80, one electric outlet wasn't working, washing machine wasn't hooked up properly).When August rent was due, she paid on the 11th and gave me a doctors certificate and said to please forget the late fee.The lease calls for a $75 late fee after the 5th plus $10 per day for every day it's late.

Flushing refrigerant lines per manufacturers recommendations, pressure test and vacuum all lines to prevent leaks and moisture.

Also, we have a (small) international airport with at least 4 major airlines AND our "downtime" is filled with snowbirds who rent by the month.  2 of my 3 rentals are fully booked through April of next year. 

Traveling nurses and airline employees are other groups that would typically want a furnished unit.

If their CF was $10k a year, then it would take them 10 years to recover their cost...and then start making a profit.So you are saying that when United airlines buys a 300M dollar aircraft, they only make a profit when profit on that plane alone exceeds 300M?

TLDR: search for someone that can replace just the compressor side and “convert” the furnace/air handler to run on new freon by vacuuming out the coolant lines. 

Neighbors told me she vacuumed her bare floors for well over an hour every single day.

You'll also need storage space for cleaning supplies, change of linens and towels and small miscellaneous items like a first aid kit, extra batteries, flashlights, broom, vacuum, etc.