What AC_hacker said.
Radiant floors do resolve ductwork loss problems, remove higher wattage blower fans from the equation, replacing them with what can be(although not always) super low wattage pumps, and you can pull cycles long if the water heating source isn't massively oversized.
The issue is usually that radiant floor systems involve tons of labor to retrofit and for people who aren't doing the retrofit as a DIY project, it would make sense to just spend that money on super-insulating the house. I've been doing the math on this now that my local PUC might be approving my gas company to raise the monthly service fee another $7/month and I'm looking at a positive cost benefit and reduced energy usage by going with mini-split heating. It'll take roughly R40 walls(XPS or polyiso outsulation), R60+ ceiling, and my rotting wood windows(replaced with u-0.2 or better) and siding(also rotting) would be part of the work to get my -13f design load under 10k BTUhr.
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