When bringing plants inside for the winter

I live in Canada so I have to try to salvage some of my planters for the winter. I’m wondering if I should build a greenhouse in my garage ? as I can’t fit all of them in my living room and more importantly by the window for light. For the smaller cacti and such that I brought outside for the summer , should I change the soil completely and or spray them with something to kill any bugs /spiders etc so my house and other plants doesn’t get infested