Depends on the construction of the house...concrete or masonary and it gets hard, and expensive.
before you spend on that, why not try a very good vacuum or 2 with hepa filter and be sure to store the vacuum in the garage?

Anything can be done, have a company who installs Central Vac systems to come out and give you a few suggestions. Most companies are local and they know construction methods in the region and they will give you your options and what will involve. Have 2 or more companies to come out and see what they say.

Most work involved when installing new Central Vac's in existing homes is finding where you can run your vac lines and the bigger job after that is patchwork and getting everything painted...

Today its a bit easier to do this thing, you have cameras that 95% of contractors that I know have them and all you need is a 1" hole to slip the camera eye and it will light up the entire bay... When doing that in most cases we remove the trim, make a small hole in the sheetrock above the plate and slip the camera eye in there to see if anything there that might be in the way, put the trim back and you never know anyone was there.

If you have masonry construction, in most cases they will build small chases for the pipes in the least conspicuous places, like closet's etc, the pipe is fairly small so it can be easily hidden.

As the credit goes, if there are no code violations with the things in question and how they installed or if this is a standard practice, people don't usually give credit for these items unless they're really generous with their money.

Good luck with your new home.

Thank you for your thoughtful comment. We will have a few contractors come out once we close. Appreciate your knowledge on the subject :-)

From a seller's point of view, the features of the house were stated and obvious. If you missed these details when deciding to buy the home and thus didn't adjust your offer, that was your mistake. Whether or not these features are expected at that price point is not an issue to discuss once you have picked the house you want to buy.

Those items you will miss are upgrades and you have been spoiled by those features at your current home. Get some quotes on adding them in and you may decide the price tag is too high for the convenience or you may find them rather affordable. Installation is expensive and the price quoted will reflect the construction details and your location. Anything is possible and only you are in the position to decide whether the convenience matches the money spent.

Costs will vary widely depending on location and house. We are building new 2,700 SF single story with crawl space and the price quoted for us for four outlets was $550 at time of construction and $1,300-$1,700 for rough-in if done in existing house (not including electrical).

Thousands of Florida homes had to be repiped when they developed pin holes in the copper in the slabs. They were all repiped through the attic. If they can fish water supply lines through existing walls, you'd think a vac wouldn't be out of the question.