Lasko Products - Air Circulators
This is what I used all last winter. I kept it in my bedroom where Ollie's cage is. It kept the room all nice and toasty all winter, even with the apartment thermostat set at about 65. It has an automatic kick on feature, so I'd just set it at about 74ish, and if the temp got down to 72 or 73 it'd kick on itself and warm back up to 75.
I called the company and they told me it didn't have any teflon or anything in it.
I'm very happy with it- best heater I've ever had.