As an example, you can have a brand new HVAC, but if your insulation is 100+ years old, it's going to be an uphill battle.   

I live in Maryland, and we're pretty well insulated from economic turmoil thanks to our proximity to DC. 

And it's still one of the least expensive areas of the state to live in so I think STRs are plausible and fairly insulated from seasonality since we have year round recreation.

All of these duplexes are modular.Some things I have learned:1) Modular homes absolutely appreciate the same as a standard stick especially if you highlight to your lender the performance improvements such as:-Higher R value insulation.

Your inspector better clean up the insulation they leave on the ground though.

Perhaps a bit noisy but, not if you have insulation under them (when installed). :)  Keep in mind, that YES they are more expensive AND, they may actually get small "dimples" in them from hail... it will show (in many not all) forms of metal roofs but that is NOT covered by insurance (cosmetic damage). 

I think the smaller 2-3 bedroom STR's are a little bit insulated though there are some large condo projects going on as well. 

The renovation process may involve updating the interior and exterior of the home, replacing outdated fixtures and appliances, improving insulation and energy efficiency, as well as meeting safety and code requirements.

Choosing the most expensive insulation because it's the most energy efficient, should allow you to reduce and/or eliminate costs in other areas.4 - Energy efficiency isn't made up of added costs.5 - Energy efficiency is the product of reducing energy needs, not supplying added energy.6 - Cost effectiveness is a product of maximum use of materials, as in little or no waste.All of the above should be obvious, in parts. 

They can buy and install windows/insulation/cabinets/etc for less than you can buy them for....