Your opinions on when to replace internals

[Stephen Lee]

Hi everybody,

I'm looking to increase my volume to closing on 1 new flip a week by the end of the year. I was just wondering what everybody thought about when to replace non-cosmetic items in the house. I usually almost always replace things like the AC condenser unit, electrical panel, furnace, hot water heater, etc unless they look/are fairly new (less than 10 years old). I was just wondering what others strategies are on this. I've heard everything from "kitchens and bathrooms sell houses" to people who swear by always replacing or at least servicing these items just to ensure that they don't have any problems during inspection. 

Let me know what you all think! Do you have a set age for these items that they'll always be replaced? Do you at all base your decision off of how these items look to the naked eye? Do you take into account what the finished property is going to sell for?

Thanks!