How do people have pet hamsters in Canada? Please read?

If winter here gets so cold, how does anybody keep a hamster as a pet? I'm wanting to get a dwarf hamster, we generally keep our house around 16° celsius, is that ok or too cold? Almost everywhere I've looked says they need to be 20° celsius, but we can't keep our house that hot. Can I get a dwarf... show more If winter here gets so cold, how does anybody keep a hamster as a pet? I'm wanting to get a dwarf hamster, we generally keep our house around 16° celsius, is that ok or too cold? Almost everywhere I've looked says they need to be 20° celsius, but we can't keep our house that hot. Can I get a dwarf hamster or am I out of luck?
Update: We have heat, we just keep it low cause 3 of us have asthma and the artificial heat from the furnace causes breathing issues.
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