To me this is very market dependent and product dependent.. in our Market some developments that are red hot that Lennar owns they might only offer 5k on a 600k sale.

Ok, so maybe I am not getting it but I have a hot water boiler with separate zones for each unit.

Its up to you as the builder to negotiate a fee that your happy to pay.. and Frankly market conditions dictate commission in hot markets one might be able to just stick a sign in the yard and do yourself.. still pretty tough or just put them on MLS and negotiate the buyers agents commish like the new rules dictate..

I think it was a super hot market, both my properties back from 2021 have done well.

Demand for rentals is near non-existent in this specific town during the winter, and demand is extremely hot in the summer months.

How do you come up with $60/PER DAY as a hot spot charge?

It's certainly enough data to point you in the right direction.Otherwise, here's an article I published on the fastest growing economies in the nation, and many of these places are quite affordable and good places to start (Cincinnati, Columbus, Oklahoma City, etc).13 Real Estate Hot Spots You Won’t Want to Miss Next YearI hope my perspective helped.

Justin Long (the STR landlord) didn't do so hot in that movie lol.Been doing mine for 2.5 years. 

For context, 4 adults and all our tech living here, we were running about $250/mo on average per month for electricity anyway... outside of summer a/c useage. so all in all, its saved me about $2k a year if i had to guesstimate for you (it stays hot here through October usually).i still owe about $23k on mine, have no intentions of selling the house. but if i decide to move out and rent the whole house out, our market would support higher rent in exchange for no electricity bill. i think you just need to decide what YOUR main benefit of having the panels are. for me it was for the house-hack, and consistent billing, despite the usage. if its strictly for property value increase, i'm not sure it would be worth it, pending your specific market. 

Portage Park has been a hot growth area!