We bought a portable sauna. They work great. I wouldn’t be deterred by the lower temperature. You’ll sweat plenty.
What I caution against is getting one large enough. I’m 6ft and can fit in ours ok but it’s not a fun and relaxing experience like a real sauna because you are sitting on a little folding chair inside a box.
If you want to park it in front of a TV and do a heat adaptation routine, it’s fine but it’s not like having a nice full sized sauna.