Are cold calling or broker relationships more effective?

You can also tell her to call the utility company about the best way to save, as turning off heat and on is not efficient having to run longer blasting out cold air as opposed to leaving it set at a lower temp. :)

Cold calling, mailers, signs, google/Facebook, RE meetups, RE agents are all ways a whole sales would find deals

you know you get a good hail storm and the storm casher/roofers are out in force telling everyone insurance will replace your roof.. they cold call you..

And from there, you will be knocking doors, sending fliers, cold calling, networking with wholesalers, scouring Craigslist and FB marketplace, all the MAYBE find a deal.  

You also don't have to face those icy cold winters.

That way guests can enjoy it year round even when it's not cold.

Door knock, cold call/text, mailers, social media, etc. 

We'd love to escape the cold Dutch winters and enjoy a warmer climate.When we're not using the property, we plan to rent it out as an Airbnb to generate passive income.

Don't expect these people to have anything to do with you once the transaction is over and a lot of bitter, nasty fights along the way.