I have a tile floor in my kitchen. It does not have any in-floor heating. Are there any good products that could be put on the underside of the subfloor in the basement to help heat the floor and room some?
Yes, if you have a hot water heating system in the rest of the house, you can certainly add a zone using PEX tubing mounted under the subfloor. If not, you can consider one of the many electric radiant heat systems, mounted from the kitchen side. However, those would require a new floor to be installed at the same time to get the maximumn benefit. Learn more here about radiant heat for floors.