  This Snowmass 2021 contributed paper discusses a Higgs-Energy LEptoN (HELEN)
$e^+e^-$ linear collider based on advances superconducting radio frequency
technology. The proposed collider offers cost and AC power savings, smaller
footprint (relative to the ILC), and could be built at Fermilab with an
Interaction Region within the site boundaries. After the initial physics run at
250 GeV, the collider could be upgraded either to higher luminosity or to
higher (up to 500 GeV) energies. If the ILC could not be realized in Japan in a
timely fashion, the HELEN collider would be a viable option to build a Higgs
factory in the U.S.
