I'm looking into insulating the attic above a closed-in back porch & the estimate also included adding additional insulation on top of the blown-in in the attic.

What kinds of factors can be used to think about the value of additional insulation?

For reference, I'm in Florida & keep setpoint around 80 degrees F most of the time when home, and 86 when not home. Power bills in the summer are in the $150-$180 USD range.

It's currently R27 and the quote is to add R11 to bring it up to R38. Code here appears to put new construction at R38 as a minimum, but looking at some charts - it looks like I might have already hit diminishing returns?

This chart I found on "Energy Vanguard" seems to suggest that going from 27 to 38 isn't much of a difference.

Does anyone else have any insight on when those diminishing returns are hit, and if it can make any appreciable difference in power bills? The house itself is comfortable enough, without large swings in temperature.

https://undark.org/2023/07/05/neglect-of-a-museums-collection-could-cause-scientific-setbacks/

IN A DUSTY ROOM in central Florida, countless millipedes, centipedes, and other creepy-crawlies sit in specimen jars, rotting. The invertebrates are part of the Florida State Collection of Arthropods in Gainesville, which totals more than 12 million insects and other arthropod specimens, and are used by expert curators to identify pest species that threaten Florida’s native and agricultural plants.

However, not all specimens at the facility are treated equally, according to two people who have seen the collection firsthand. They say non-insect samples, like shrimp and millipedes, that are stored in ethanol have been neglected to the point of being irreversibly damaged or lost completely.

When it comes to how the FSCA stacks up with other collections she’s worked in, Ann Dunn, a former curatorial assistant, is blunt: “This is the worst I’ve ever seen.”

Experts say the loss of such specimens — even uncharismatic ones such as centipedes — is a setback for science. Particularly invaluable are holotypes, which are the example specimens that determine the description for an entire species. In fact, the variety of holotypes a collection has is often more important than its size, since those specimens are actively used for research, said Ainsley Seago, an associate curator of invertebrate zoology at the Carnegie Museum of Natural History in Pittsburgh.

A paper published in March 2023 highlighted the importance of museum specimens more generally, for addressing urgent issues like climate change and wildlife conservation, with 73 of the world’s largest natural history museums estimating their total collections to exceed 1.1 billion specimens. “This global collection,” the authors write, “is the physical basis for our understanding of the natural world and our place in it.”