The NWFA guidelines are a good place to start for advice on radiant heat under a wood floor. There is also a discussion on the link listed at the bottom. Hardwood Floors Magazine has a forum discussion at http://hardwoodfloorsmag.com/forum/topic165-solid-pine-over-radiant-heat.aspx. Launstein has a web page devoted to radiant heat at, http://www.launstein.com/radiant-heat/radiant-heat.html. American cherry and walnut are know to be more stable so are often suggested over radiant heat. There are a number of species that professionals have experienced problems with including Brazilian cherry. You might look at the discussion at http://hardwoodfloorsmag.com/forum/topic109-jatoba-over-radiant-heated-gypcrete.aspx Here is a link that might be useful: Blog on Radiant

My mother is 85 years old and has Parkinson's, so she has trouble getting around. I am keeping her in mind with your question. I would go with a low pile carpet, if you were my parent. It is softer for when she falls down. Mom has hardwood in her foyer, dining, and halls, and although they are beautiful, they are mostly covered with throw rugs, which are a tripping hazard, but less slippery for her. She has trouble with getting a "grip" on the floor when standing up, and carpet helps with that. Wheelchairs will run grooves in a hardwood floor.

Choosing the right flooring type isn't enough for your living condition. You will have to consider the types of cut: flat sawn, rift and quarter sawn, quarter sawn or live sawn. Quarter sawn and rift & quarter sawn will be best choices, because expansion and contraction is along the thickness of the wood. You will need climate control all year round. 70 degrees at 40 % relative humidity is where you want to be throughout the year. The use of a humidifier/dehumidifier will be needed year round. Although, engineered flooring is more stable than solid. Using the wrong wood specie in your living condition can run the risk of de-laminating with engineered wood. If, the top veneer is more or less stable than it's core and backing. You will experience de-laminating in extreme humidity swings. Take in account of what the engineered flooring is constructed of: mdf or plywood. The width of the flooring will account for how much expansion and contracting also. 2 1/4" strips are the most stable. As you go wider, expect to see more wider seasonal gaps. Proper acclimating is critical, should be performed with a moisture meter. For 2 1/4" strip flooring , sub-floor and flooring moisture should be within 4%. For all other widths 2% moisture differentiation is allowed or should not be exceeded. Don't forget proper expansion gaps, which is the thickness of your flooring, example: 3/4" thick = 3/4" gap. Sub-floor type and condition will affect the performance of wood floors. All this needs to be considered for the proper and successful performance of your wood floors.

I bought Downs H2O LVT. It is made by CoreTec from James Duty at Cloister Flooring America in Lititz, PA. I think you and I might be in the same area - not sure if there are any other Cloister Flooring Americas except the one's in Lititz and Ephrata.. One of the other brands I looked at was Kardean, but it was quite a bit more expensive and took me over budget. Price check other stores in your area. Flooring America, Carpet One, Pro Source, and Floor Trader Outlet will have the same "Exclusive" product with a different name.. Different stores in the same chain can and most likely will have different pricing. Flooring America in Etown was more expensive than Cloisters. Carpet One in Annville/Cleona was the highest price when I did my comparison. I really like the people at Cloister Flooring America and love that they offer assistance getting started if you are wanting to install yourself. Again - COVID may be limiting the service, but when I got mine they offered for someone to come to the house for an hour and show you what to do there was a cost, but something like $100.00. They also rent some of the supplies. Everyone else I talked to pressured me to have it installed and pretty much said "You're on your own." Also, if you can wait till after the holidays, flooring should go on sale. Generally everyone wants flooring done by Christmas and then the market hits a lull and stores are trying to drum up business. I don't have a clue how COVID may change things this year. If we are dealing with the same "Cloister Flooring America" ask if they will be having an anniversary sale in March. I think that is an annual sale for them.