Ember.js controller variables reseting after page refresh

Using Ember.js:

I have a Route

App.QueryDataRoute = Ember.Route.extend({
  model: function(params) {
    return Ember.RSVP.hash({
        propertyObject: this.controllerFor("cres").get("properties").findBy('title', params.propertytype_title),
        nrOfOffers: this.controllerFor("queryData").get("nrOfOffers"),
        deal: this.controllerFor("queryData").get("deal"),
        price: this.controllerFor("queryData").get("price"),
        surface: this.controllerFor("queryData").get("surface"),
    });
  }
});

All those .get('[variable name]') are variables inside QueryData controller.

PROBLEM: After page refresh I lose those variables ofcourse because they are declared as null again inside the controller.

QUESTION: How can I not reset the variables inside the contorller after page refresh so that I can load them again from Route.