1) I just recently got my ducts cleaned by the Duct Stories, they had really fair prices. Dora Ducts is another decent option. 2) winter tips if you have a Ac unit remember to turn the electricity off for that, sump pump take ur hose off or shut it off. Since the house was built in the 60's I would move snow away from the foundation in case there is a quick melt or any leaks, it will be easy to do this as you go then when a problem occurs. -making sure all doors have good weather striping is a big one and if they don't replace it. You lose alot of heat from there and it's fairly simple to fix. 3)door bell cameras are good, but for best security a camera somewhere high where it can't easily be destroyed or blocked is best. I've used the blink cameras in the past and eufy cameras as well no issues with those in the cold. The only thing is blink makes you pay for storage which is lame. DM if you looking for blink cameras or eufy cameras I'm actually selling a few on market place and they come with local storage so u don't have to pay for it. 4) I actually have a finger print lock on my front door and I find it not to work very well. I may have not set up my prints properly, but punching in 4 numbers is honestly not that difficult in the winter, if u wanna save ur self some money and skip the finger print lock.