I nominate Betty White. She'd be perfect for the role and it would give her immortality for a while longer.

GeoSmart.

I built a new house in the summer of 2016 and have a horizontal geoexchange/heatpump system. I'm north of Ottawa Canada, winter days can be well down in the -30C. I use an EcoBee to control/monitor it the HVAC. The geo heat system has 2 stages to it, on the coldest days the 2nd stage kicks in. I've not had to use a backup heat source (although I do have an electric resistive heat coil in the system). It was designed to provide 97% of what I needed, with a few days to use the backup (as stated elsewhere, it is cheaper to use electric heat for this than to build the system bigger). System is also used to produce some hot water for me and of course in summer it provides A/C (Summer temps can go up in to the +30C range with a lot of humidity.). One thing about these systems is that they don't like sudden changes in the set temperature. I.e. Don't set the temperature back at night, otherwise it will try to use the backup heat source to warm the place up faster in the morning. Better to just have a constant temperature 24x7.

I went with this system because I am out in the country and cheap natural gas wasn't an option. When I lived in Ottawa, I had natural gas. I've found my energy bills are about the same here, but have shifted seasons. Electric A/C was expensive in summer but offset by cheap natural gas heat in winter in Ottawa. Here my bills are more constant year round, with summer being cheaper than winter especially in the coldest 2-3 winter months.

Overall, I'm quite happy with the system now after 3 summers and winters. Also like that I have no burning heat sources in the house. No carbon monoxide to be concerned about, etc. Being in the country and having some power outages, I have a whole house generator as well. It of course burns fuel (propane) but it's outside. It powers the heat system (even enough for the resistive heat), so I'm covered there as well and will have heat even during a power outage.

Hear hear! I am so bloody sick of everything being covered in Ads these days. I'm a .mac subscriber and the lack of Ads is a big deal. I don't want to subject my friends/family to more ads just to view my content.