Yup, You can heat the water instead. Being in the basement, light is you main barrier. You can do this cheaply by using the sun or buy expensive lighting fixtures.
I'm using just normal CFL bulbs, they are already installed, when the rack was upstairs(no other light in that room either) they did fine, so thats not really too much of a problem :P
My main concern is if aquarium plants will grow with this aquaponic style though