And in my house its 72F and if you got your
room temps about right you wont need a heater...

And temp is your Betta's tank at??
It's too cold for Bettas. 72*f is much too cold for Bettas, and room
temp water will be less than that.
You need a heater.
Please research the proper care of Bettas if you won't listen to anyone
here...especially a breeder. Sheesh.