Keeping hammy warm while I'm at work

[Piebald]

Hi
I am considering adopting a hammy--glad I found y'all first!
I have been reading with interest all about the best housing. I am interested in a Syrian having had one ("Piebald") many many years ago.
I would like to know how people in colder climes keep their hammy warm when they are working? I would be out most of the day and cannot heat the house for the hammy! It can get fairly cold during the day. I have kept reptiles before and with them you have temperature zones so they can self-regulate their body heat. The warmer zone was accomplished with a special lamp at one end of the enclosure.
Can something similar be used for a hammy? Should it?
Any suggestions or experiences are welcome!
Thank you
Pie