I know the product needs to adjust to the temperature/humidity before being installed.

If the big expenses were around $10k each, that would add an added 13 years to recover that cash, and this repeats, so you never catch up.The dollars (not percentages) you need to make, and use for analysis, must be based on your plan requirements...NOT some arbitrary number that you adjust as you go to make a property work.Your not going after properties...you're going after deals. 

I signed up to check it out and see a couple of flaws:You can't see the unit pricing they are using for each item (it just has a Yes or No switch that adds an unknown amount to your Total Budget)You can't adjust the pricing for each itemYou can't save the pricing as a template to be reusedWithout knowing the unit pricing they are using for each item and not being able to adjust the pricing for each item it's hard to tell if it's truly accurate.  

@Phillip S.Did you talk to your insurance agent or an adjuster?

Repair Bills (Just more things to go wrong over time).Service life (adjust the cost for inflation and see what kind of CAPEX you need for it).It's not needed to attract tenants (like an A/C system is in most places). 

There's more to a property than the amount of down payment required.Airbnb in winter in a cold climate.

Will people continue to move out of the North/ Northeast into warmer climates?

You need human to pull and make adjustments.

Best of luck and let us know how it goes and how you adjust fire as you proceed.

Doing a JV on each property we can even adjust how we do it on each.