For your night time drop if you can get to 65 F reliably and use an ice filled fan it is doable. If your humidity tends to be low a cool mist humidifier gets me another degree or two drop. I keep the ice packs for use in the summer and just set them above the sleep spot on the cage top. I have so many now I'm having to just use the AC or open windows most of the year to get a decent drop.
If your comfortable sleeping under a bunch of blankets you could let your house drop down to 60 F in the winter and your veiled will like that too, Your family may not go for that but it will save money on heating.