Hello,
According to IT-221R3, I think you can still keep your house in Canada, but you need to rent it to a third party and the house should not be avaialble for your immediate usage. (http://www.cra-arc.gc.ca/E/pub/tp/it221r3-consolid/it221r3-consolid-e.html )-->

Where an individual who leaves Canada keeps a dwelling place in Canada (whether owned or leased), available for his or her occupation, that dwelling place will be considered to be a significant residential tie with Canada during the individual's stay abroad. However, if an individual leases a dwelling place located in Canada to a third party on arm's length terms and conditions, the CCRA will take into account all of the circumstances of the situation (including the relationship between the individual and the third party, the real estate market at the time of the individual's departure from Canada, and the purpose of the stay abroad), and may not consider the dwelling place to be a significant residential tie with Canada except when taken together with other residential ties (see ¶ 17 for an example of this situation and see ¶ 9 for a discussion of the significance of secondary residential ties).

Cheers